Namura (NA-50008) 39.96mm Piston Kit Fits: Polaris SCRAMBLER/PREDATOR 50 2001-2006 Piston kits come with the piston individually wrapped; a set of OEM quality rings packed in their own box, a wrist pin, and circlips Features MOS2 (Teflon/Molybdenum) Coated Skirts, a rolled-on application process provides a bond that is 10 times stronger than other spray on coatings for increased heat transfer, reduced friction, and helps eliminate cold seizures The Machined Smooth Heads reflects combustion heat and reduces carbon buildup, protecting the top of the piston increasing horsepower and fuel economy by up to 6 percent Anodized Domes increase heat resistance and durability; pistons with anodized domes are 75 percent stronger than non-anodized pistons