Hamilton® Plastex Wheel 3-1/4 x 2 - 3/4" Roller Bearing, Hamilton Casters, Mfr#: W-320-P-3/4

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. Can be operated continuously in temperatures ranging from -50 to 260 degrees f and intermittently to 300 degrees f.