Hamilton Hi-Heat Plastex Wheel 5 x 1-1/4 - 1/2in Roller Bearing

a fiber filled phenolic resin, molded under extreme pressure, gives this wheel the ability to carry heavy loads without damaging floors in intermittent service. They are non-marking, resist corrosion from oil, water, grease and commonly used acids or solvents, and will not spark. This high-heat variation can withstand continuous operation at temperatures up to 475 degrees f.