These non-toxic, flexible mixing bowls are ideal for mixing silicone casting material, such as Mikrosil™, or for use with Plaster of Paris, Traxtone or any other type of Dental Stone. The bowls features a non-stick surface that is resistant to chemicals and petroleum products. Clean-up of most materials is simple. Simply wait until the casting medium is cured, then bend the bowl to release the material from the rubber surface. Available in two sizes.