3D Printed Flat Chastity Cage with Deep Inverted Penis Cup | F3216C

The F3216C 3D Printed Flat Chastity Cage shares the same lightweight yet durable resin construction as the F3216A, along with the same sleek flat profile. It comes with four different base ring sizes, allowing you to find the fit that suits your body best. But what truly sets this model apart is the redesigned Inverted Penis Cup—longer, narrower, and more intense.

Unlike the wider and more shallow cup found in the F3216A, the Inverted Penis Cup in the F3216C features a deep, slender tunnel that pushes the penis into a more compressed, elongated posture. With a cylinder length of 35mm and an inner diameter of just 10mm, this design demands more from the wearer—not just physically, but mentally. It creates a tighter, more engulfed sensation, amplifying the experience of containment and feminization.

This extended, narrow form also means the tip of the penis sits further inside, enhancing the sensation of “tucking in” or disappearing altogether. For many locked boys, this deeper inversion feels more psychologically immersive—it’s not just restraint, it’s erasure.

And like its sibling model, the F3216C’s Inverted Penis Cup remains hollow, allowing for clean, controlled urination without the need to remove the cage. It’s a daily wear design that prioritizes hygiene without compromising on restriction.

Prefer a more standard setup? The metal cup is fully removable, letting you switch to a classic flat cage style whenever desired.

Compatible with a matching belt in three color options (sold separately), and equipped with five one-time plastic travel locks, the F3216C gives you flexibility, mobility, and an upgraded psychological edge.

SPECIFICATIONS

• Model: F3216C
• Material: Resin
• Weight: 83g
• Color: Black, White, Pink, Dark Blue
• Flat Cage Diameter: 1.37 inch / 35 mm
• Flat Cage Thickness: 0.28 inch / 7 mm

BASE RING DIAMETER ：

• 1.65 inch / 42 mm
• 1.77 inch / 45 mm
• 1.89 inch / 48 mm
• 2.05 inch / 52 mm
  

INVERTED PENIS CUP ACCESSORIES

• Material: 304 grade Stainless Steel
• Inverted cyliner Total Length: 1.30 inch / 33 mm
• Inverted cyliner diameter: 0.94 inch / 24 mm
• Inverted cyliner Length: 0.78 inch / 20 mm
• Penis cup diameter: 1.1 inch / 28 mm
  

BELT ACCESSORIES - [OPTIONAL]

We offer an optional elastic belt accessory for this item, if you are interested in it you can use it with this item, the elastic belt is also compatible with all chastity cages in our store, if you are not interested in it please select “none”

• Material: Nylon fiber + rubber + latex
• Color: Pink, White, Black
• Intro: Applicable waist 33.50 inch - 51.20 inch (85 cm - 130 cm).
• Compatible with all FRRK Chastity Cages

• 1 Cage
• 4 Rings
• 1 Connection
• 5 One-Time Plastic Lock
• 1 Metal Padlock with 2 Keys

*Your privacy is of our utmost importance. All of our items get shipped out VERY DISCREET. With no weird markings on the packaging of any kind. It will be your little naughty secret and no one will ever know what's inside.