Wiseco Piston Kit - 2.25mm Oversize to 68.25mm 573M06825 All Wiseco Pistons are forged from high silicon, low expansion aluminum which offers superior strength, reduced weight, improved heat transfer, and longer life Pistons can be installed in any of todays cylinder bore compositions (cast iron, chrome, nikasil and boron composite) with confidence Wisecos state-of-the-art computerized manufacturing facility is dedicated to supplying both the high-perfomance racer and recreational enthusiast with the finest forged piston available in todays market place All kits come with pistons, rings and circlips