Competition series street/strip caliper with 5-1/4 inch mount, 1.75 inch piston and fits a 0.812 inch rotor. Calipers are constructed from 6061 T6 billet aluminum. Assembled with stainless steel pistons and bleeder screws. 25 percent more pad contact area than other calipers with this mount. 20 percent thicker pads than other calipers with this mount. Dual pad pin design with O rings to eliminate pad chatter. Uses an off the shelf D43 pad available at any local parts store. Available in both street and race versions. Race versions do not have dust seals. 100 percent made in USA.