Polyurethane tread, 90+ shore(A) durometer, chemically bonded to cast iron core, non-marking floor protection, resistance to oil, grease, water and most solvents, available in a variety of colors.
Swivel: Two rows of ball bearings in hardened raceways.
Fork: 1/8" formed steel plate.
Axle: 1/4" diameter bolt and nut for small plate; 3/8" diameter bolt and nut for large plate.
Finish: Chrome or Zinc Plated.