FMJ 300 Set

(3 customer reviews)


The FMJ 300 Set includes the FMJ 300 Cage and matching Base Ring. Undetected When Going Through Airport Security.

The FMJ offers the utmost in comfort and security and sensory denial. The ring design is extremely comfortable and secure. The cage portion has one bottom opening allowing use at urinals, ventilation and hygiene.


Product Description

Undetected When Going Through Airport Security.

The FMJ 300 Set includes the FMJ 300 Cage and matching Base Ring. FMJ 300 are for those that want very little access. Total denial a solid construction that is very comfortable and secure. All lengths are design to ensure it is conceal under clothing to go unnoticed for everyday wear. The totally restricts you and your key-holder from touching your genitals for sexual pleasure. This gives the total Key-holder control over the sexual fulfillment of the wearer. Choose your cage size, base ring, color. Remember that you can customize the Custom Size Base Ring or Custom Size FMJ cage.

Surgical Nylon – This is the most superior light weight material available. Surgical Nylon is very durable, wear-resistant, feels more comfortable on skin compared to all other plastics. This material is impervious, does not allow for bacterial growth. Perfect for the man that has an active lifestyle, work and play and wants to be caged 24/7/365.

4 standard size surgical nylon Ghost 300 set

4 standard size surgical nylon Ghost 300 set

A= Length

B = Diameter / Circumference at base

Cage to Base Ring Spacing – There are three space sizes 7mm – 9/32″, 10mm – 7/16″, 13mm -1/2″

Base Ring = 8mm – 5/16″  Double Base Ring = 16mm – 5/8″

Total cage length
With single base ring* and standard 10mm spacing**:
Regular: 60mm (2 – 11/32″)
Medium: 80mm (3 – 5/32″)
Tall: 110mm (4 – 21/64″)
Grande: 128mm (5 – 11/128″)

*Add 8mm for double base ring.
** Subtract 3mm for 7mm gap. Add 3mm fro 10mm gap.

Cage dimensions of the Standard Cage

Regular – A= 42mm (1 -41/64″) B=28mm (1 -7/64”) / 87mm (3.5 inches) – Round Shape
Medium – A= 62 (2 7/16″) B = 33mm (1 – 1/4”) / 103mm (4 inches) – Oval shape*
Tall – A= 92mm ( 3 -5/8″) B = 33mm (1 – 1/4”) / 103mm (4 inches) – Oval shape*
Grande – A = 110mm (4 – 3/4″) B = 39 (1 – 1/2”) / 122mm (4 – 2/3″) – Oval shape*

* The oval shape is to reduce the profile so that it less noticeable under your clothing

standard size chart picture

If you required a different size than have a Custom Made Cage made for your comfort and desire.

If your are not quite sure how to measure yourself then read our page on How to Measure Yourself a Custom Chastity Device


3 reviews for FMJ 300 Set

  1. Greg

    Dear Lady Fox,
    “The Full Metal Jacket device I purchased is excellent!
    Well designed. Ergonomically well thought out, light but durable, easy to put on and very hard to get off if properly sized. I actually can’t take mine off without either destroying it or ripping my balls off (not into being a castrate).
    I am looking forward to getting the device in stainless now. It’s great that I was able to try it in plastic first.
    Custom Chastity’s service is first rate and they communicate! They tell you where you are at as they produce and ship your device. Nice difference.
    I have about a dozen trap ball devices and this is the best designed and most effective.”

    Cheers G.

  2. supremecinema (verified owner)

    I got mine in purple, and i got the grande. I’ve been wearing it off and on for about a month, trying different activities in it, to make sure that i wouldn’t have any issues, once I’m required to wear it 24/7. I’ve exercised strenuously in it, I’ve slept in it, I’ve urinated with a semi-erection it.
    Couple of notes. At least for me and my anatomy, the pee hole is too low. I had to file a slit in the top of the cage, so i could urinate properly, especially in the morning when i have a semi-erection. And I found that getting into the device is easiest with the “stocking method”. When I try just using lubricant, I experience pinching where the top of the cage meets the base ring.

    But it’s lightweight, but strong. I can move freely in it, with no issues. With my slight modification, I’m able to pee standing up. Really, the only time I’m acutely aware that it’s on, is when I attempt to get hard.
    But, it’s definitely a great product. I’ve tried a few off-the-shelf chastity devices, and this one is by far superior in every aspect. I’ve already recommended it to a few people.
    I still wanna play around with the sizes and types, before getting a more expensive one.

  3. Jet70546 (verified owner)

    Excellent construction and extremely comfortable to wear. Had issue with the magic lock fitting in the slot, initially (actually broke the key while inserting it). After ordering another lock, I love it! I don’t even know it’s there unless I start to get hard.

Only logged in customers who have purchased this product may leave a review.

You may also like…