silicone,the heart couple molds make from silicone materials, which is full of durability and flexible. the smooth and highly flexible inner surfaces will make a glossy finish casting Enjoy diys fun,you can also use animal resin molds to make resin home decorations, compatibles with most resins or other casting materials. you can add-glitters, resin dyes, beads, dry flowers or accessories to make your creation more diversed Widely application,our molds can not only make but also perfect for diys handmade ornaments soap, resin, cakes, mousses, chocolates, ice cream and so on Wonderful gift,definitely would be a big surprise if you-share your finished product to your family or friend as a gift on halloween, thanksgiving, christmas, birthday, holiday and so on Easy domolding,put the or chocolate epoxy resin into the skull molds,wait after it drys completely you just simply push from the bottom and then pull out ,ordinary people can become artists