... proof natural rubber tire·High air-holding inner tube·Ply Rating: 2PR/4PR·Ball Bearing/Roll Bearing/Bush Bearing etc·Plastic/Steel ... manufacturing all kinds of wheels, tires and wheel barrows: PU foam Wheel, pneumatic rubber wheel, solid rubber wheel, powder rubber wheel, semi-pneumatic wheel ... .80/2.50-4, 8”x1.75, 8”x2”, 8”x2.2”, 8”x2.5” 8”x3” -10inch: 10''X3.00-4, 10''X3.50-4, 10x1.75”, 10 ...