Recycled rubber with minimum tensile strength of 300 PSI * Hard durometer of 60 Shore A Nominal * Approximate weight: 1/4" weighs 1.25LBS per square foot * Pre-cut widths and lengths available in 3 thicknesses (5mm, 1/4", 3/8") * Always stocked and shipped within 24 hours with a 3-year Rubber-Cal warranty