Boneyard Low Hangers Ball Stretcher Training KitThree graduated silicone rings designed for safe, progressive ball stretching. Start with the smallest ring and advance to larger sizes as your comfort increases. Stack multiple rings together for customized stretch intensity. Soft, seamless silicone won't pinch skin or hair, and the smooth finish feels natural against your body. Includes small (20mm), medium (30mm), and large (40mm) rings for a complete training progression.