Athena Piston Kit for 700cc Big Bore (A) - 47.6mm Bore 070902A All pistons are forged using a precision heat-treatment process that allows for production tolerances of just .005mm Forged piston kits are available in A, B and C sizing Forged piston tooling allows for the lightest available product Kits include antiwear coated piston, rings, pin and circlip Made in Germany