1720-0048 Gold+ racing friction material is made of a proprietary blend of organics and trace iron designed to provide great stopping power in wet and dry conditions FITMENT INFORMATIONApplication for:Performance Machine - 4-piston 125 x 4R, 137 x 4RRevtech - 4-pistonPart Number : 1720-0048 1720-0048 Gold+ racing friction material is made of a proprietary blend of organics and trace iron designed to provide great stopping power in wet and dry conditions FITMENT INFORMATIONApplication for:Performance Machine - 4-piston 125 x 4R, 137 x 4RRevtech - 4-piston **** PLEASE NOTE ***** : 1720-0048 These are performance and custom aftermarket products sourced to match or exceed original specifications as an alternative to the OEM version. Any Harley-Davidson part numbers referenced are for identification purposes only.