4oz EnviroTex Jewelry Clay. A blend of premium epoxy and clay powders resulting in a smooth porcelain like surface that will not shrink when cured. Has a long working time (up to 2 hours), and cures to a hard, durable, shock resistant product. Create your own custom designs with glass, metal, wood, crystal, etc. Easy to mix, shape, mold and add texture. 24-hour full cure. Complete instructions enclosed with professional jewelry design tips.