Lightweight forging for instant throttle response and maximum torque Antidetonation grooves and ring land diameter eliminates ring blow by while maximizing engine performance Computer engineered piston skirt profiles provide minimal cylinder wall friction Wiseco forged pistons are superior in strength and design Reed induction Nikasil Bore Cylinder sleeving or replating required for oversizes Top-End bearing sold seperately Note: All Wiseco piston kits are supplied with Piston, Ring and circlips. Wrist Pins are included unless noted.