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