Hamilton Aqualite Wheel 4 x 1-1/2 - 5/8" Plain Bearing

this aqualite wheels is one of the genre loosely referred to in the industry as "polyolefin" or "polypropylene," but unlike most competitive designs, this wheel has heavily-sectioned hubs and rims to withstand the rigors of industrial service. They are injection molded from blended polymers that provide an impact-resistant wheel impervious to water, brine, gasoline and oil, and most common acids, chemicals and solvents.