These Neoprene rubber rolls have a durometer of 55-65 * Neoprene rolls weigh 2.25lbs per square foot in 1/4" inch thick * Available in 8 thicknesses (1/16", 1/8", 3/16", 1/4", 3/8", 1/2", 3/4", 1") * Black Neoprene rubber with minimum tensile strength of 725 PSI (5 MPA) * Ideal as neoprene pads, neoprene gasket material, neoprene seals & neoprene strips