Wiseco (554M09000 90mm 2-Stroke Piston Kit Fits: Honda CR480R 1982-83, Honda CR500R 1984, Honda CR500R 1985-88, Honda CR500R 1989 Forged from high-silicon aluminum alloy for maximum strength and dependability Innovative forging design and piston skirt provide maximum horsepower and torque Dedicated forgings used for superior strength to weight ratio utilizing aerospace alloy All Wiseco high-performance motorcycle pistons come with rings and circlips