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:
3.8 cm
4.0 cm
4.4 cm
4.8 cm
5.1 cm
5.4 cm
5.7 cm
