Hard Neoprene roll is a blend of SBR, CR and NBR rubbers * This Neoprene rubber in 1/8" thick weighs 1.25lbs per square foot * Hard durometer of 65-75 offers limited pliability and low elasticity * A dense Neoprene gasket sheet with minimum tensile strength of 725 PSI (5 MPA) * Pre-cut sheets of neoprene are sold in 8 gauges (1/16, 1/8, 3/16, 1/4, 3/8, 1/2, 3/4, & 1 inch)