CB-X Replacement U-ring #4

There are seven sizes of replacement u-rings for use on all CB-X® chastity devices. A CB-X complete kit includes u-ring sizes #1-5. The #4 u-ring has an inner diameter measurement of 1.63 inches and is available in clear, black, and pink. Please note that all U-rings in a complete CB-X kit are individually stamped with a number corresponding to the sizes of the replacement U-rings.Includes: One #4 u ring Measurements(inner diameter): #4 - 1⅝ inches (41.3mm) Material: Lightweight, medical-grade polycarbonate plastic If you need a U-ring larger than the #1 (2") supplied in your chastity kit, check out the Large and X-large U-rings, which are sold separately - available individually or in a 2-pack (1 x large, 1x X-large).