Dome/Dish requires no deburring or preparaton 100% CNC machined billet piston Specifcally designed for high horsepower Subaru racing engines up to 1200hp Manufactured from high quality, certfed 2618-T6 aluminum alloy Internal and external strut braces Premium 9310 steel wrist pins included (.905 x 2.250"), DLC upgrade available Pin ftng, Tru Arc locks, and rings included