VERTEX PISTON KIT CAST 53.96/STD KAW - 175-22248BAll piston skirts are coated with a hi tech Molybdenum Disulphite coating for faster break in time and increased piston life Cast Replica piston kits are gravity cast aluminum alloy (not forged) with 18% silicone content, which produces an extremely light but very strong piston Forged Replica pistons are forged from 2618 aluminum for superior strength and durability Forged High Compression pistons improve power and torque across entire rpm range