.020" Foam Bleaching Laminate Tray Material - 120mm Round, 50/Pk. Vacuum Forming Material with Foam Layer. Ideally suited for making a bleaching tray and withstanding bleaching products. Perfect for bleaching teeth using carbamide peroxide. It is thin, only .020 inches thick once it's formed over the model. It has a foam liner to absorb the bleach, thus decreasing the bleaching time for the patient.