Tri-Color Mouthguard Laminate - Assorted, 12/Box. 5' x 5' .160' (4mm) Two Layer Vacuum Forming EVA Material. Soft EVA Resin is a rubber-like clear material easily formed and trimmed for bleaching trays, soft bruxing appliances, indirect bonding and TMJ splints. 12 sheets per pack, complete with FREE attachable, break-away mouthguard straps. Box of 12 sheets