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Single piston aluminum caliper, patented bimetal aluminum/stainless piston, oil impregnated bronze bushings, ceramic pads with stainless steel backing plates stainless steel slider pins, GalvX coated hub and galvanized mounting bracket.Precision bearings, seals, and grease factory installedFactory pre-installed stainless steel slider pinsEach kit is for one wheel, includes mounting bracketStainless Steel rotor with venting holes for faster coolingG4.5 Upgrade Kits replaces G4 caliper with G5 caliper with lifetime pads5 on 4-1/2" bolt pattern