silicone , and flexible to use, good heat resistance, not easy to break. Small and lightweight, easy to make decorations and store,can making beautiful crafts and send it to your friend as a . Can work well with most casting materials like , plaster, resin, wax, clay and more, add any materials like powders, and sequins into the mold. Can be applied to make various crafts like keychain,bracelets,pendant,decoration tools. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!