Most Wiseco 2-cycle pistons are forged from high-silicone bar stock, Greater strength and lower expansion at high temperatures, Complete piston kits include High-Performance forged pistons, rings, wrist pins, circlips and top-end gasket kit for one complete engine, All Wiseco High-Performance pistons are priced with rings, wrist pins and circlips, Wiseco ring types are not interchangeable (i.e., CD is not interchangeable with LC) and fit only Wiseco pistons, WARNING: Wiseco pistons can be fitted only with Wiseco rings.