Onyx is our 3-piece penis ring set featuring 3 multi-size rings that can be used alone or together as a group. Onyx is made from Liquid Silicone that is both super stretchy and strong. All of our Vibelite items include our 1-Year Warranty. FEATURES: - 3-Piece Multi-Size Penis Ring Set - 3 Sizes Fit Most - NEW Liquid Silicone Composition - Super Stretchy - 1-YEAR REPLACEMENT WARRANTY Diameter Small: Inner 2.5 cm; Outer 4.5 cm Medium: Inner: 3.2 cm; Outer 5 cm Large: Inner 3.8 cm; Outer 5.8 cm