PRO-FORM Sport Mouthguard Square 12/Pkg - ProformFeatures: Pro form manufactures the only pre made laminated mouthguard material in the industry Has long been considered the leader in custom made mouthguard By laminating two layers of soft EVA together, the laminate has excellent tensile strength All of these features make the Pro form mouthguard laminate the material of choice for custom made mouthguard 12 pkg Proform material Available in : Squares: 0. 160 (4mm) 5x5 (127 x 127mm) 12 Pkg Rounds 0.