If you're looking for a cast piston that performs like a top and slides like this one, choose a Pro X piston kit for your bike, UTV, or ATV. Pro X pistons are the first cast piston made from a specialized low-expansion, low-friction aluminum alloy commonly used by Japanese OEM engine builders to give the piston an incredibly low coefficient of friction. For you, this translates to a perfect cast piston for 2-strokes and 4-strokes that has the durability of a forged piston but at a much lower cost. Some models come with a tin-based skirt coating that reduces wear during and after the usage process. This black coating is also helpful during engine maintenance, as any excessive wear to the piston skirt or cylinder wall will be very evident in the wear patterns of this coating. Pro X uses the best materials available along with innovative designs to bring you pistons custom-built for your machine's unique requirements. So if you're worried about whether Pro X piston kits are right for you, don't be. Pro X has you covered.