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This Is a Replacement for a Single Piston, Does Not Replace Entire Set. Dedicated Forging. Light Weight and Superior Strength. Dome Design. Improved Flame Travel. Includes Chrome Plated Piston Pin. Horizontal Slot Pin Oiling. Reduced Friction/scuff Resistant. Pressure Seal Groove. Maximum Ring Seal. Skirt Coated - Armor Glide. Dedicated Rings. Maximum Compression and Oil Control. Race-Ready Dome Finish. Smooth Edges for Improved Combustion Flow. Bore Size (Mm): 97 11:1 Compression Ratio. KTM Fitment: 520 SX 00-02 520 EXC 00-02 525 SX 03-10 525 EXC 03-10 525 XC ATV 08-10 Polaris Fitment: OUTLAW 525 07-08 Please Note: The Image Displayed Is Representative of the Piston, However Circlips, Wristpins & Rings, as Well as the Specific Type of Piston Will Vary Based on Your Model.