100% flexibe reusable silicone, cast with cement, resin, wax, sugar etc etc Silicone is non reactive material, it can bear 100-120C degrees, it can be freezed, Molds should be washed with soap after each use. A pinch of oil or release agent should be used before casting. With proper care molds can be used again and again almost infinite number of time. Silicone mold
