... certificate:ISO9001,CCC 4.full size hand truck wheels Professional manufacturerwheelbarrow wheel,rubber wheel,trolley wheel,we ... tube and butyl tubeInner tube rubber pencentage :20% 30% 40%Rim model :Bolted rim welded rim centered ... ), (2)rubber wheels(pneumatic rubber wheels, solid rubber wheels, tubeless wheels, foam wheels, rubber foam wheels, polyamine foam wheels, castor wheels), (3)wheel rims ...