Replacement Black U Rings for all CB X chastity devices. these U-Rings are compatible with all models and spare parts. A CB X complete kit includes U Ring sizes  numbers 1 to 5. Needing a U-ring larger than the  number 1 supplied in your kit?

Find our Large and X large sizes here. availablein a 2 pack.

Seven sizes of U Rings are available for CB-X chastity devices.

Large measurement is 53.975mm and Extra large measurement is 57.15mm