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 : 34227 34235 WC250410 WC250450 W610026 W610040 53402-65D00 53402-67D00 91174801 91175624 WC370073 WC370153 WC129463, Kit Includes: 2x Rear Drum Brake Wheel Cylinder (Both Side)