Piston Kit - 67.00 mm - 13.1:1 CR - Yamaha JE designs are specifically engineered for extreme applications including professional competition, Machined from 2618-T6 high tensile forged aluminum, Domed, dished or flat top features smooth flowing radii; require no deburring or preparation, Kit includes piston(s), wrist pin, circlip and rings unless otherwise noted, Made in the USA