Boneyard Silicone Ring 5 Piece Kit Black. Five different size C rings: 1.2 inches, 1.4 inches, 1.6 inches, 1.8 inches and 2 inches. Boneyard 5 pieces Kit Black. These must have man toys are 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, these rings 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.