J.E. Pistons Piston Kit (1745cc., 3.937in. Bore) - Standard, 10.75:1 Compression 317212From Daytona to Bonneville, JE Pistons continues to set the standards in street bike piston design JE has recorded wins at Daytona with American Hondas CBR600RR, low ETs on the drag strip and land speed records at Bonneville Machined from 2618 T6 high tensile forged aluminum Dome dish features smooth flowing radii; require no deburring or preparation JE designs are specifically engineered for extreme applications including professional competition