Includes (2) pistons, rings, wrist pins, circlips, caged wrist pin needle bearings, and a full gasket kit including crank seals. Pistons are for the standard bore (78mm). Engineered to provide the best possible path for combustion chamber heat transfer to cylinder walls. PTFE coated to create the least amount of friction during the break-in period. Manufactured to the original OEM specifications. Fitment: 1999 Arctic Cat ZL 600 EFI & Carb.