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Namura Piston Rings for 1999-06 Honda TRX350 Rancher - 79.21mm - NA-10007-3R 2008 Harley-Davidson Road King EFI - FLHR 2002 Arctic-Cat 500 4x4 FISNamura Technologies Piston Rings Part Number: NA 10007 3R Piston Rings are an essential part of piston performance, engine efficiency, and durability. Namura piston rings are designed specifically for each application with the best materials and precise fitment. Composed of either a highly ductile cast iron or stainless steel alloy. Quality provide excellent wear resistance and a gas tight seal. Often overlooked and unglamorous, they are an essential