Manufactured by SPI Includes 2 pistons, ring sets, wrist pins, circlips as pictured SPI pistons are engineered to provide the best possible path for combustion chamber heat transfer to the cylinder walls All SPI pistons, rings, pins, circlips are manufactured to OEM specifications All individual components are interchangeable with original parts Piston weight is compatible with original piston T-Moly series with Teflon-Molybdenum coating T-Moly series pistons reduce friction, resist seizure, improve durability Made in Taiwan Pistons are for standard bore size 71.00mm Fits 2001 Arctic Cat Mountain Cat 500 EFI 2001 Arctic Cat ZL500 EFI ESR 2001 Arctic Cat ZR500 carb 2001 Arctic Cat ZR500 EFI 2001 Arctic Cat ZR500 EFI ESR 2002 Arctic Cat Mountain Cat 500 carb 2002 Arctic Cat ZL500 carb 2002 Arctic Cat ZR500 carb 2002 Arctic Cat ZR500 CC carb 2002 Arctic Cat ZR500 LE carb ***Pistons are for B case motors and have 22mm wrist pins***