Engineered with Heat-Flowed cast iron to give our wheel cylinders the ideal balance between tensile strength and hardness, Anodized coating provides complete 360º protection against rust, moisture and oxidation, Reinforced pistons (FeSi) feature higher tolerance to pressure and increased wear resistance, PCRVi (Pressure Conscious Reducing Valve integrated) reduces pressure buildup, Trivalent-coated bleeder screws provide extra protection and added durability, Premium ProSeal™ Nitrile Rubber (NBR) cups and boots for long lasting performance, Wheel cylinder bores are surface tested to ensure an optimum sealing surface for the pressure cups, Part Reference Numbers : 34244 34285 WC250980 W610121 W610131 19133369 19213348 8-19213-348-0 8-89058-902-0 89058902 89059126 WC370148 WC370180 WC141537 WC141538, Kit Includes: 2x Rear Drum Brake Wheel Cylinder (Both Side)