Racing Choice Pistons are 1 ring, 2-Stroke or 2 ring, 4-Stroke with reduced weight and friction as well as increased power and throttle response. Note that service intervals may be increased over conventional Wiseco Pistons. 2-Stroke Pro-lite Pistons feature lightweight forging for instant throttle response and maximum torque. Computer engineered piston skirt profiles provide minimal cylinder wall friction. Anti-detonation grooves and new ring land diameter eliminates ring blow-by while maximizing engine performance. Piston kit includes pistons, rings, wrist pins and circlips. Note that oversize requires cylinder sleeving and top end bearing is not included in kits. 4-Stroke Pistons feature dedicated forging for lightweight and superior strength. Race-ready dome design provides improved co