The QALO® Women’s Silicone Stackable Ring Set features two non-conductive, non-porous silicone rings, each with their own unique design. Features Silicone rings Women's Jet Black Bead Stackable Silicone Ring Women's Blue Moonstone Geo Silicone Ring Non-Conductive Non-Porous Dimensions Bead: 2.4 mm thick x 3.5mm wide Geo: 1.85mm thick x 3.5mm wide Tensile Strength: Bead: 8 lbs. Geo: 6 lbs.