Mature Metal


Queen’s Keep

SKU 135 Category Tag


Lock Options

OPTIONAL – 3 sets of pins for one price. 3 pins per set. 3 different styles. Mix & Match.

Punishment Pin 1

Punishment Pins 2

Punishment Pins 3

The Queen’s Keep is a marvel of durability and convenience. Featuring an open front design, it is exceptionally easy to clean without the need to remove the device. Its lightweight and compact nature ensure discreet wear under clothing, making it perfect for continuous use. The comfort is so remarkable, you’ll forget you’re even wearing it!

Punishment Pin and Security Screw options are available for this item.  The inside diameter has to be 1 1/4″ or larger and the length must be at least 1 3/4″ for the punishment pin option to fit.

BUILD TIME is 6-8 weeks from date of order.

Please email your rush request to, an invoice will then be sent to you.   Your build time will start the day the invoice is paid.  Mailing time is not included in the build time.
The prices are in addition to the cage order.
1-2 WEEK BUILD TIME $450 $350 SALE
2-3 WEEK BUILD TIME $225 $175 SALE

Device is constructed of 1/8″ X 1/2″ flat bar and 1/8″ round rod to construct the cage on the tip.  Please know that a proper size lock should sit sideways. Lock not included.
Base ring is made from 1/4″ round bar. All parts are handmade and can be built to any size. Made of 304 and 316 stainless steel.
316 stainless steel means that it will not corrode in chlorinated or saltwater pools. 

If you choose the security screw option, it will come with two keys and two screws.

Weight About 5.0 OZ. depending on size. 

If adjustments are needed, we will need the cage and ring returned.

Your device will be mailed USPS priority mail (no signature required) within the US or USPS priority express international/UPS for orders outside the US.
You are responsible for ALL duties and taxes issued by your country. Please check with your local postal service if you have any questions about your duties and taxes.

Cage Inside Diameter

1" (25.4 mm), 1 1/8" (28.6 mm), 1 1/4" (31.8 mm), 1 3/8" (34.9 mm), 1 1/2" (38.1 mm), 1 5/8" (41.3 mm), 1 3/4" (44.4 mm), 1 7/8" (47.6 mm), 2 1/8" (54.0 mm), 2 1/4" (57.1 mm), 2 1/2" (63.5 mm), 2 5/8" (66.7 mm), 2 3/4" (69.8 mm), 2" (50.8 mm) ​​

Base Ring Inside Diameter

1 1/4" (31.8 mm), 1 3/8" (34.9 mm), 1 1/2" (38.1 mm), 1 5/8" (41.3 mm), 1 3/4" (44.4 mm), 1 7/8" (47.6 mm), 2" (50.8 mm), 2 1/8" (54.0 mm), 2 1/4" (57.1 mm), 2 3/8" (60.3 mm), 2 1/2" (63.5 mm), 2 5/8" (66.7 mm), 2 3/4" (69.8 mm), 2 7/8" (73.0 mm), 3" (76.2 mm)


1 1/4" (31.8 mm), 1 1/2" (38.1 mm), 1 3/4" (44.4 mm), 2" (50.8 mm), 2 1/4" (57.1 mm), 2 1/2" (63.5 mm), 2 3/4" (69.8 mm), 3" (76.2 mm), 3 1/4" (82.5 mm), 3 1/2" (88.9 mm), 3 3/4" (95.2 mm), 4" (101.6 mm), 4 1/4" (107.9 mm), 4 1/2" (114.3 mm), 4 3/4" (120.6 mm), 5" (127.0 mm) ​​


1/4" (6.3 mm), 3/8" (9.5 mm), 1/2" (12.7 mm)


Round, Oval

16 reviews for Queen’s Keep

  1. Scott

    my first lock up in the queens keep was for three months ,its very efective ya cant get out
    this is the real thing becareful boys ya could end up bien a sissy like me


    This is by far the best chastity device I have had. It is so much more comfortable then the plastic types.
    I have now been locked up foe 41 days, which is the longest time yet. It is easy to keep clean and no smell.
    I also have the “anti-pull out system” which my goddess puts in some times as punishment or just because she feels like it!

  3. DesertOwl

    Hi All,

    Firstly I can say, with confidence, that based on the personal ownership of various “more affordable” mass produced, plastic or imported metal knock-offs that after purchasing the Queen’s keep that those devices were simply a waste of money. More on this later.

    Fanny, my key-holder, allowed me to select a Queens Keep to secure her property until she fancies using it. The decision on this particular device was based on web-reviews of the different Mature Metal designs along with extended back-and-forth email exchanges with Mistress MM.

    Mistress MM sets a new standard for customer service. She weathers the “overly focused” inquiries potential buyers might have and is prompt, concise, honest, technically focused, patient and promises nothing that isn’t delivered.

    It has been a month since Fanny received her “Queen’s Keep” and honored me by using it to take possession of her property. There are absolutely no fit or finish flaws with the Queen’s Keep. The workmanship is without equal. I can also say that having a craftsman that is into the lifestyle who designs chastity devices is a definite plus (if not an absolute requirement).

    During the past month the device has been removed a couple of times for a medical check-up and the scheduled weekly grooming and hygiene regimen. Other than that it is has been worn 24/7.

    After wearing the device the first week (with little discomfort) I took some of Thumper’s advice about applying a spot of silicone lube to areas where freshly washed skin might tend to adhere slightly to freshly washed stainless steel causing some minor stretching/irritation. Since applying the lube (and leaving aside those times when arousal isn’t involved) I can say I am 98% unaware I am wearing Fanny’s device during daily routine. Supremely comfortable.

    Fanny’s penis tends to ‘prairie dog’ (retreat in the tube) which, in less well designed devices, has led to it falling out of the bottom of the tube. In this device when Fanny’s plaything retreats due to temperature (or bending and lifting things) and then decides to stick his head back out of his burrow to see what’s “going on” the design channels him right back into the cage. (For reference we ordered the 3/8″ gap between rings.)

    I, like a lot of others out there am a bit of ‘security queen’ in terms of unauthorized remove-ability of a chastity device. It’s not so much that I’m inclined to cheat as much as relishing Fanny’s control and my inability to circumvent her decisions. With this device I just don’t feel the urge to even try and remove it since i know it would just awkwardly dangle from my testicles.

    Again, taking Thumper’s advice we measured the relaxed, flaccid length and then subtracted 1/2 inch, that is, shorter is more comfortable.. We took this approach because we also know from experience (with plastic and steel) that larger often means more room for error and from one of the Lori devices, more weight in that steel is heavier than plastic. A certain level of substantial metallic ‘heft’ can be a pleasant reminder of your owned status but constant weight suspended from a PA is just plain painful or cruel – something no responsible owner would inflict on her property. Would you hang your car from its front bumper when not using it? of course not.

    We ordered the 7/8 anatomical ‘A” ring which was comfortable enough based on the use of the Mature Metal sizing ring set. After this first month maybe the next smaller size would work for the longer term. I would also consider trying 1/4″ gap between rings rather than 3/8″ to ensure the “prairie dog’s” tunnel is marginally longer, but, would offer the advice of sizing for best fit first and making any adjustments late since, except for the cage itself, Mature Metal can offer smaller rings and gap adjustments at reasonable rates.

    So, here’s my advice. You may be on the Mature Metal site on a hormone/fantasy fueled forced march. I know I was was – more than once. Or maybe you’re here indulging someone you love or want to love more deeply again in yet another of their “crazy” notions. If you’re the least bit serious about exploring this form of play then do yourselves a favor since whining over the ill fit of a cheaply made, however adjustable ‘one size’ device should be no reason for cutting short your mutual explorations. There will be other more important and challenging discoveries you both will have to overcome.

    So, Key-holder, buy yourself a well crafted, quality, custom fitted device at the outset. You deserve it and, by-the-way, the person who is offering you what they consider the most precious part of themselves is worth it too. You might both think it’s expensive and while I can see that, I can also it really isn’t when looked at as a level of a sacrifice and commitment – and isn’t that what’s at the heart of what is going on inthis intimate exchange. I’m prejudiced about such things but, to me, it’s on the level of a wedding ring. No, actually, it’s a deeper commitment than a wedding ring.

    Best to all,


  4. Ryan

    The product restored my faith in long term chastity. None of the other 5 devices I owed were comfortable or clean enough for long term wear without any unlocked time. The oval ring makes a huge difference.

    I have been using this device for about a year now and can tell you be careful what you wish for because you won’t be able to blame this product for anything.

    My wife also loves the device and actually feels like it encourages her to enjoy the chastity game a lot more.

  5. Mike

    The queens keep is incredible! The cage by itself is very pleasing to the eye and looks stunning when in place. My Mistress often finds herself drawn to playing with it just by the sight! We ordered fully loaded with all options and so glad we did. The anti-pull out spikes make sure you don’t try and back out (pun intended) and the spike strip is purely mid evil for when she wants to inflict some pain and suffering. Wearing it is extremely comfortable and sometimes I don’t even feel like it is there! Only thing I would suggest is get the sizing rings as we had to send mine back for a smaller base ring. I wear a 2″ round ring when I play but that does not equal a 2″ oval ring so we had to send back for adjustment. Of course though, Traci and Bill were extremely helpful in getting it sorted. Great company and great products!!!

  6. Kevin

    I have had my Queens Keep now for over a year and have been locked up 24/7 for almost the whole year . It is a perfect fit and the workmanship is superb. After having worn CB units for a few years when this steel unit was locked on me it felt very real, this was really serious chastity. What I really like is no more broken plastic parts. Also the plastic would flex and occasionally my testicle would would get pulled through between the cage and the ring, didn’t feel very good and also loss of security. In over a year this has never happened with 1/4″ gap. We have the security screw so no bulky noisy lock banging around, also have the anti-pull out pins, Madame likes to put one in sometimes for a little CBT, very effective when she teases me into trying to get erect.

    Great product if you are really serious about chastity, definitely goes beyond being a toy.

  7. David Hernández

    I received my device 3 days ago.
    I wear it since he came, even sleeping, is perfect, lightweight, comfortable, hard, soft.
    I bathe with, is to clean without removing the device.
    The handwork and as, with care and precision is the best, perfectly fits my body.
    It’s awesome!
    Mature Metal is best.
    I was trying other chastity devices, plastic and other metals. Mature but Metal is the best.
    I live in Spain and no problem, they are very profesionales.Te help and advise so that you leave no doubt.
    Loving women from Spain controlled male chastity, do not lose more time or more money. Mature Metal is authentic and genuine.
    MetalMature recommend 100%.
    Thank M. M. My wife is very happy and me too.
    He recibido mi dispositivo hace 3 dias.
    Lo llevo puesto desde que llego, incluso durmiendo,es perfecto, ligero, comodo, duro, suave.
    Me baño con el , se limpia sin necesidad que quitar el dispositivo.
    El trabajo hecho a mano y a medida, con cariño y precision es lo mejor, se adapta perfectamente a mi cuerpo.
    Es impresionante!!
    Mature Metal es lo mejor.
    Estube probando otros dispositivos de castidad, de plastico, y otros metales. pero Metal Mature es el mejor.
    Yo vivo en España y ningun problema, son muy profesionales.Te ayudan y asesoran, para que no te queden dudas.
    Amantes de la castidad masculina controlada por mujeres de España, no perdais mas el tiempo, ni mas dinero. Metal Mature es autentico y genuino.
    Recomiendo MetalMature al 100%.
    Muchas Gracias M.M. Mi mujer esta muy contenta y yo tambien.

  8. Jonathan Clausen

    Literally the most amazing chastity device in the market. i can TOTALLY understand the 6-8 week wait time (though it was less) as this device is a high quality custom piece. All, and i mean all communication, was prompt and courteous with amazing knowledge. my device fits like a glove and i am so so pleased….and so is Mistress.

  9. Paulaclit

    This is by far the best chastity device I have had. It is so much more comfortable then the plastic types.
    I have now been locked up foe 41 days, which is the longest time yet. It is easy to keep clean and no smell.
    I also have the “anti-pull out system” which my goddess puts in some times as punishment or just because she feels like it!

  10. MD

    Finally a chastity device thats extremely comfortable to wear and stylish. Had a couple of the plastic units but they both fell apart within a year or so. The device is a work of art and I recommend it to any one debating to get one or not. Customer service and communication are top notch.

    Been locked up since 1/22/2013…the day the device arrived. My GF is loving this and the power she has over my orgasms, or lack of orgasms.

    Thank you MM

  11. JN

    After being locked in a CB2000 for years, it literally wore out. I decided to try a CB6000S. I was disappointed with how difficult it was to keep clean and dry.

    Moisture in a confined space causes skin irritation. The beauty of the Mature Metal devices is that they\’re constructed to be open to allow air circulation.

    I ordered a Queen\’s Keep a full inch shorter than my CB6000S and, amazingly, was able to put it on dry and it has remained on since it arrived.

    I\’ve am locked for months at a time and FINALLY have a fit that I forget I\’m wearing. Most of the time it feels like it\’s just not there.

    The beauty of the Mature Metal devices is the custom fit.

    I do not want to achieve erections, I do not wish to ejaculate and I do not wish to have an orgasm.

    My partner accepts this.

  12. Nick

    I introduced idea of chastity to my wife 4 years ago and we’ve since used it on and off in our marriage. I’ve tried several devices including the Duo, CB6000 and CB3000. The 3000 seemed to be the best for long periods but I experienced many issues with splitting and more importantly, constant hygiene issues. My wife had to let me out to clean almost daily.

    We started shopping around for a while looking for an alternative. The overwhelmingly positive reviews we found for Mature Metal made us confident that their device would be a great investment. After a few days of discussion with mature metal and their unbelievably great customer service; we landed on a model (Queen’s Keep) and size that would suit us perfectly.

    My wife made me change to the new cage as soon as it arrived and all I can say is wow… The comfort is unreal; I can wear this device 24/7 without any issues what so ever. The best part for my wife is that I am able to clean everything with minimal effort without being let out (I am uncut and I can pull back to get to those tricky spots too).

    When I ordered this device I only expected it to be a bit better but I was wrong. Psychologically, this device is on a different level. It makes everything before feel like a toy. This is very… real. Being custom sized, it’s very restrictive so you can’t have the freedom you might of experience with a generic model.

    Truly a great purchase for hard-core enthusiast or vanilla people like us to spice up a relationship.

  13. Buzz

    Received the Queen’s Keep about two months or so ago but due to unforeseen circumstances had to wait until last week to start “playing” with the new device. If you really, REALLY, want serious chastity, this device is for you. Previously owned a CB-6000s and after a couple of conversations with William was able to pinpoint the right measurements. This thing fits like a glove. The inability to “grow” is actually a plus as this device is much more rigid than the plastic models. My wife/keyholder asked me to put together a slideshow of chastity captions in what I wanted this round and when I showed it to her she simply smiled and said I think we can do that.

    I am not sure how long she is going to make we wait but I can tell you that she has hidden the key and i can not find it and based on the caption slideshow it will be a very satisfying period for her!

  14. Scott

    my first lock up in the queens keep was for three months ,its very efective ya cant get out
    this is the real thing becareful boys ya could end up bien a sissy like me

  15. schatje van Lady Rose

    My Mistress puts me in the Queens Keep a week ago with Her promiss to hold me in Chastity till my birthday in June.
    I’m very excited about it. The Queens Keep fits like a glove.
    Only at night I’ve some trouble because my penis will grow but he can’t.
    I go to the bathroom to pee and solve that problem.
    We are very happy with the name and design of the piece of art.

    Thanks Mistress MatureMetal and William to spice up or D/s relationship.
    Milady wants a FLR on the 24/7 base and that is more than i ever dreamed of.

    proud schatje van Lady Rose from the Netherlands.

  16. WY

    My Mistress purchased this device almost two years ago, with a few exceptions I have been required to wear it constantly. It still wears,great, and the longest duration of 93 days I had no problems with comfort or cleaning. It is so comfortable you almost forget it is there but the security and weight is a erotic reminder it is still there and locked away.

    Thank you mature metal for making my Mistresses Dream come true.

    Humbly yours, Will

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