Sintered Brake PadsSecond-to-none in their stopping abilities and wear characteristics while still providing excellent reduction in noise and dust Asbestos, nickel, and lead free Made in the U.S.A. If you are using aftermarket billet steel rotors it is recommended you use our Organic-Aramid brake pads to avoid damage to them. Sintered pads are not recommended for billet steel rotors as the pad material is too aggressive for those rotors. Performance Machine 125 x 4R (0052-1602) calipers137 x 4R (0053-2901/2902)Pads are 8mm thick