Athena has developed a wide range of cast pistons for the off-road market. Manufactured by using advanced production technologies, Athena cast pistons, besides being lighter, represent the best solution in terms of price, performance and reliability. These pistons are treated with a transparent "tin-coating" or with a black "Moly-coating" and are sold complete with rings, wrist pin and circlips. Replacement standard piston for the Athena Factory Cylinder Kit. Specially designed, high-performance Cast-Lite, flat top piston. Piston is sold complete with rings, wrist pins and circlips. Note: Piston and directly related parts ONLY; all other parts sold separately. Detailed Specifications: For 53.94 mm big bore cylinder.