Wiseco 822M05400 Piston Kit is designed for a Kawasaki KX125 2003 model with a standard bore diameter of 54.00mm. It includes a forged aluminum alloy piston, wrist pin, ring(s) set, and circlips. The piston has a diameter of 53.95mm and is made in the United States. The product carries a California Prop 65 Warning for potential health risks.