100% Silicone Sleeve with Silexpan Core. Bendable, Fexible, soft Silicone dong Thermo Reactive, softer when heated and harder when cooled. Phallic head and sculpted veins feel like the real thing Strong suction cup sticks to any flat surface. Harness compatible Can be warmed or cooled in water or 1 minute in the microwave for a variety of sensations Use only with water based Lubricant.