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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 different sizes, so you can find your best fit.
U-ring sizes for CB chastity device:
3.8 cm
4.0 cm
4.4 cm
4.8 cm
5.1 cm
5.4 cm
5.7 cm
