silicone , and flexible to use, good heat resistance, not easy to break. Small and lightweight, easy to make decorations and store,can making beautiful and send it to your friend as a . Can work well with most casting materials like clay, plaster, resin, wax, clay and more, add any materials like powders, dried flower and sequins into the mold. Can be applied to make various like keychain,pendant,decoration tools. Package includes: 1x Keychain Mould