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If you need a U-ring for your CB chastity device, then you can purchase an extra one here.
The U-rings are used as a backpiece so that you can lock your chastity device, and it comes in 5 different sizes, so that it fits you best.
U-ring sizes for CB chastity device:
MATERIAL: Transparent plastic.
INTERNAL DIAMETER: 1.5 inch, 1.6 inch, 1.7 inch, 1.9 inch, 2.0 inches, 2.1 inches, 2.2 inches respectively.
COMPATIBILITY: Amongst others, CB-6000, CB-6000s, CB-3000 and The Curve.