This 12" x 3" Polyurethane On Iron Kingpinless Swivel Caster is a perfect caster choice for those who need a reliable, silent and ergonomic caster that can satisfy the needs of almost any environment. Polyurethane On Iron  Swivel Caster wheels present debris-rejecting excellent polyurethane tread that is chemically and mechanically joint (for maximum security) to a featherweight-yet-robust aluminum core. This caster pairs the Polyurethane On Iron wheel with a strong, zinc-coated swivel rig from Atlanta Caster. Every Polyurethane On Iron wheel comes with a precision ball bearing or roller bearing  for the highest performance in applications that require persistent stops, starts and turns.