6" Rigid Caster Air Filled Pneumatic Wheel, 200 lb Capacity, Ball Bearing

Some arrived fully aired up. Others were completely flat. One had a bad valve stem and one tube had a hole in it. The second batch of these I ordered were not the same as the first. The inner bearings were wider than the first delivery and when swapped wouldn't even turn. I was really hoping these were going to do the trick. I will say that the aluminum frame and caster assembly are very heavy duty. The rubber tires are too. If only the valve stems and inner tubes were heavy duty.

Does not hold air over a few month period