For those men who may need a size larger than the U-rings included in a CB-X chastity cage kit, consider purchasing this extra-large U-ring (inner diameter 57.2 mm), or a large U-ring (inner diameter 53.98 mm). XL chastity cage ring inner diameter: 57.2 mm Includes one extra-large U-Ring Compatible and interchangeable with all CB-X penis chastity cages. For men with a larger size Contains one large U-Ring Compatible with all CB-X chastity cages Available in multiple colors