... material:steel 3.Used for wheelbarrows 4.Superior quality Rubber Powder wheel 14''x4''Wheel choice:While choosing a wheel, ... several elements: what size and load, pneumatic or solid, or semi-pneumatic, steel or plastic rim, hub length, bearing diameter etc ... 2pr/4pr/6prTubes:natural or butyl tubeRim: steel or plastic rim, offset or centereed. If steel: powerrd coated, or zinc platedBearing: ball ...