Metal: the mould flexible and non-stick, very practical and durable. 100% pure, professional food grade silicone. BPA, PVC and phthalate free. Elastic material: the silicone moulds are flexible and non-adhesive. This kind of silicone material has strong elasticity and a lubricating surface, so it won't break when removing the soap or cake. Safe to use: these moulds are safe to use in the oven, microwave, freezer and dishwasher. Silicone cake baking moulds temperature resistant from -40 to +446 F (-40 C to + 230 C); easy to clean, microwave, oven, refrigerator, freezer and dishwasher safe. Easy to use: flexible and non-sticky silicone mould, easy to peel, perfect for soap making, cupcake baking and ice cream and chocolate cooking, candles, cake accessories, best handmade DIY mould for your kids. WIDELY USE: Ideal for DIY cakes, muffins, mooncakes, jellies, tarts, puddings, soaps, biscuits, etc.