Choose one black CB-X replacement U-ring in one of six selectable sizes: #1, #2, #3, #4, Large, or XL. CB-X publishes each ring as compatible and interchangeable with its chastity devices. This is one U-ring component—not a complete cage or a multi-ring kit.
Size and identifier guide
| Selected size | Maker-published inner diameter | Store SKU | CB-X black SKU | GTIN-12 |
|---|---|---|---|---|
| #1 | 2 in / 50.8 mm | CB6727 | URING1BLK | 094922426727 |
| #2 | 1⅞ in / 47.6 mm | CB6734 | URING2BLK | 094922426734 |
| #3 | 1¾ in / 44.5 mm | CB6741 | URING3BLK | 094922426741 |
| #4 | 1⅝ in / 41.3 mm | CB6758 | URING4BLK | 094922426758 |
| Large | 2⅛ in / 54 mm | CB5818 | URING-LBLK | 094922395818 |
| XL | 2¼ in / 57.2 mm | CB5825 | URING-XLBLK | 094922395825 |
The measurements above are inner diameters, not outer dimensions or circumference. This storefront currently offers #1 through #4 plus Large and XL; CB-X also makes a smaller #5 ring, but #5 is not an option on this listing.
What a U-ring is
The U-ring sits behind and around the scrotum and the base of the penis and forms the foundation of a compatible CB-X chastity assembly. It must be joined to the matching CB-X base components and the rest of a complete device. This listing does not include a cage, Base #1, Base #2, locking pins, spacers, a lock, or keys.
CB-X describes these exact size listings as lightweight, medical-grade polycarbonate plastic. “Medical-grade” is the maker’s material description; it is not an independent certification by The Stag Standard.
Choose by measurement and existing fit
- If replacing a ring that fit correctly, check its stamped size and select the matching label.
- If changing sizes, use the CB-X sizing guide and measure as directed. Do not infer fit from #1, Large, or XL alone.
- CB-X says the ring should fit snugly without pain, skin discoloration, loss of blood flow, or numbness. A tighter ring is not automatically safer or more secure.
- Start with brief, supervised fit checks. Keep the device’s normal removal method and key immediately available.
Inspection, use, and removal boundaries
- Before every use, inspect the ring and connection points for cracks, stress whitening, deformation, deep scratches, rough edges, or damage. Replace a damaged component; do not glue, heat, reshape, or sand it.
- Assemble only with compatible CB-X components and follow the complete device instructions. Never force pieces together or substitute unrelated hardware.
- Remove the complete device promptly for pain, numbness, discoloration, unusual swelling, coldness, concerning temperature change, urinary difficulty, or any fit that feels unsafe.
- Seek urgent help if the device cannot be removed safely or symptoms persist after removal.
Cleaning and storage
Follow the care directions supplied with the complete CB-X device. The exact ring pages do not publish a dishwasher, boiling, bleach, solvent, alcohol, high-heat, or chemical-sterilization method, so this page does not promise one. Clean as directed, rinse away any permitted cleaner, and dry the ring and every connection point completely before reassembly or storage.
Store clean, dry, unlocked, away from direct heat, prolonged sunlight, crushing, and bending. Reinspect before the next assembly. Do not share an intimate-use component unless the complete product’s maker instructions and appropriate barrier or hygiene practices allow it.
Browse the CB-X collection, compare the Chastity & Pup Play department, read the chastity-cage fit, materials, and safety guide, find the matching black CB-X locking-pin four-pack, check shipping and discreet packaging, or review the returns, refunds, and hygiene policy.
