Namura Piston Ring For ARCTIC CAT 300 2X4 4X4 1998-2005 STD BoreBore Size: 68.47mmSize Over Standard: StandardNamura premium world class rings produced by the largest Japanese OEM supplier in the worldNamura??s rings are designed specifically for their applicationNamura understands that the rings are an essential part of piston performance, engine efficiency, and durabilityOften overlooked and unglamorous, they are an essential part of piston performance, engine efficiency, and durability. The materials used in the manufacturing of piston rings are one of the most critical factors in their performance. Namura??s rings are designed specifically for their application. The type of cylinder sleeve, sleeve coating, size of the engine, and the stroke (2 or 4) all play a role in determining the composition best suited for the operating environment. While it may vary by model, we have outlined some of the key features below:Compression Rings: Composed of either a highly ductile cast iron or stainless steel alloy; both materials possess excellent wear resistance and provide a gastight seal. Chrome, phosphate and nitride coatings are also used to meet the demands of the application.Oil rings: consist of three separate components. Two scraper rails constructed from highly ductile cast iron or a stainless steel alloy and also have a chrome, nitride, or phosphate coating. The single expansion ring is manufactured from stainless steel.Brand: NamuraPart Number: NA-30001RFitment:1998-2005 ARCTIC CAT 300 2X4 4X41989-1990 SUZUKI LT250S QUADSPORT1991-1998 SUZUKI LT-4WDX KING QUAD 4×41999-2002 SUZUKI LT-F300F KING QUAD 4x4Note: Image is for reference only, actual product may vary slightly depending on your vehicle.