1. Material: Silicone. Approximate Size of Full Mould: 20x25x1 cm. 2. These Love letter mould are made out of flexible & durable silicone, which makes it easy to release and clean up with soap and water. 3. Twist the love heart silicon mould for resin art and pop out your finished resin work after it’s completely cured. 4. These heart shaped moulds for resin art are compatible with many casting materials, especially good for epoxy resin, casting resin, uv resin.5. Use your imagination, Add some resin pigment, resin dye, embed different kinds of embellishments or fillers, DIY your unique resin keychains with our resin pendant molds for your friends and family.