KAWASAKI 2009-2015 KX450F Vertex Big Bore Piston Kit Size B 24031B. Package was opened and piston was installed in motor for fitment, then uninstalled. Piston was not used. Motor was not fully assembled after piston was installed. Motor was never ran with piston in it. The condition of piston is like new. Comes with piston clips, wrist pin, rings and piston. All sales final.