Boneyard Silicone designed with superior materials and production thus increasing both comfort and lifespan. The powerful and iconic Boneyard branded design has a sleek silicone finish and features a superior and durable 3x stretch. The soft medical grade 100% silicone rings and non-roll design provide a snug fit that both the wearer and his playmates will appreciate. Unique to themselves, this ring synergize with the wearer, providing endless comfort when wearing under your jeans. Ideal for stacking and perfect for stores to ensure customer does indeed obtain the correct size. You can be assured that they will withstand the punishment of your longest play sessions time and time again. Keep you hard longer and stronger. No roll comfort fit. Extreme durability. 100% silicone. 3X stretch. 2.0 inches (50mm). Care instructions: safe with all lubricants. Wash after use with soap and water. Allow to air dry. Bone for life.