These man toys are designed with superior materials and production. thus increasing both comfort and lifespan. The iconic Boneyard-branded design has a sleek silicone finish and features a superior and durable 3X-stretch. The soft medical grade silicone rings and non-roll design provide a snug fit that both the wearer and his partners will appreciate. Keep you hard longer and stronger. Safe with all lubricants. Package includes five rings: 30mm (1.2 in.). 35mm (1.4 in.). 40mm (1.6 in.). 45mm (1.8 in.). 50mm (2 in.)