Manufactured in Japan by industry leading OEM factories, the connecting rods in these kits are double forged, shot peened, and barreled to give you maximum consistency throughout the material and greatly increase the lifespan of the connecting rod. Pro X also designs precisely placed oil cutouts in their con rods to improve oil delivery to the lower crank and bearings, so all mating surfaces stay lubricated even during the most extreme operating circumstances. With this kit you'll be good to go with a crankpin, big-end bearing, small-end bearing, and both washers.