CLASSICAL STYLE Cogged Belts are higher quality, longer lasting and more dense than the cheaper FHP (fractional horsepower) style belts... Unfortunately, FHP style belts are mostly what you see on Amazon, Except for us. The outer fabric wrap is treated with highly oil & heat resistant, engineered synthetic rubber compound, specifically compounded for excellent wear resistance, proven through thousands of hours of testing. The body rubber compound is a highly engineered synthetic rubber compound, specially compounded for cool running, flexibility, resistance, and excellent bonding to the outer fabric and tensile cords. Our belt manufacturers are ISO9001 certified, and every belt we sell is backed by a full manufacturers warranty.