ProX pistons provide a reliable and cost-effective way to maintain the engine in excellent condition High-quality cast piston made with dedicated tooling and molding Made from hypereutectic alloy for extra strength and reduced expansion Special ring setup for improved durability and resistance to wear Some pistons come with Full MoS2 skirt coating for improved breaking in and resistance to scuffing Anodized piston dome for increased protection against excessive heat Usage of high-quality rings such as Riken for optimum heat transfer and sealing Packed in a box containing piston, rings, wrist pin, circlips.