Namura NX-30050 40.96mm Piston Kit Fits: Kawasaki KFX 50 2003-06, KDX 50 2003-06; Suzuki JR 50 1978-07, FZ 50 1979-1983, FA 50 1980-1991, TS 50 X ALL, Estilete 50 ALL, GT 50 ALL, Katana R ALL, Zillion W 50 ALL, ZR 50 ALL; Aprilia SR 50 2010/LC ALL 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 Hypereutectic Casting Process provides higher silicon content for reduced expansion rates and additional wear resistance; with an ability to withstand higher cylinder temperatures Anodized Domes increase heat resistance and durability; pistons with anodized domes are 75percent stronger than non-anodized pistons