The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high-performance 4-strokes. Today, Wiseco&&';;s forged 4-stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4-stroke pistons are ready to deliver the power and reliability you&&';;re looking for. Engineered, forged, and machined in the USA in Mentor, OHDesigned and built for each specific 4-stroke powersports engineImproved tensile strength of forged material optimizes strength and service lifeDedicated forgings allow for optimized strength-to-weight ratioIncludes high-quality piston rings, wrist pin(s), and circlips Product Series 4 Stroke Forged Series Included Components Ring Set #9500ZV, Wrist Pin #S682C, CirClip #CW19 Bore Diameter 95.00 MM Piston Diameter 94.95 MM Compression Ratio Actual 13.5:1 Piston Material 2618 Skirt Coating Yes Piston Oversize STD Product Type Engine Piston Kit