mold is silicone, eco-friendly, , flexible, reusable and Non-stick, easy to separate, easy to clean, eco-friendly,low carbon, can be recycled, resistance to low temperature minus 40 degrees, high temperature 230 degrees, uniform heating and cooling. Simple and useful, healthfulness, corrosion resistant and adaptability Suitable for international chess, decorations, jewelry, crafts making, etc. Perfect for you and your family together.