Tiger's Plastics Retainer Material is a blend of medical grade, (FDA) approved biocompatible plastics that combines extra durability, impact and wear resistance with excellent clarity. The material is easily formed and bonds to most acrylics. Extra resilient material makes it ideal for fabricating retainers and all types of dental appliances. Available in various thicknesses, the retainer material comes in 5X5 square sheets and 120mm and 125mm diameter round.