Billet aluminum. Raw metal on black contrast calipers is anodized for a long-lasting high-quality finish. Hanger brackets and brake pads included. Made in the U.S.A.. The OLD-STYLE Wagner and Kelsey-Hayes (die-cast aluminum OEM) on rear applications have a 3/4″ bore master cylinder and WILL NOT WORK CORRECTLY.. Not recommended for use with imported stainless steel rotors.. Requires use of 5/8″ bore master cylinder..