These Molds are made up of pure silicone with excellent elasticity, superior high tear strength, etc. After squeezing and deforming, just rest for a while and then will return to the original state. The Resin Molds coaster is very versatile in its usage! Perfect for epoxy resin coasters, small flower pot base, conceret, plaster, cement and polymer clay etc; You can also add dry flower, pearl pigment, mica powder, glow in the dark powder, glitter and sequins into the resin Model to get a colorful Model. Smooth Creative Puzzle Patterns interior makes it easy to de-mold after it?s fully cured and reduces the need to cut back and polish. Or you can use release spray or soap water which may help extend silicone mold's life. Non-toxic, Safe for Crafting and Environment, Flexible, resistant to tearing, durable in use.