"Cast. Our pistons offer the performance/dependability of O.E. pistons. High quality alum., controlled casting & machining provide reliability, durability & long life of part. Up-tilt ring grooves improve piston to ring sealing & providing great blow-by control. DUROSHIELD? skirt coated piston. Moly-graphite coating, Extends engine life; Reduces friction for higher fuel economy and prevents damage from inadequate lubrication on start-up; Eliminates scuffing and wear; Helps improve cylinder sealing for less blow-by. "