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 : 34108 34294 WC14108 WC258110 W37977 W610148 25994648 58330-22000 58330-28001 WC370198 WC131446, Kit Includes: 2x Rear Drum Brake Wheel Cylinder (Both Side)