Polyurethane-on-iron caster wheels combine high load capacity and floor protection, making them ideal for many industrial environments. They feature a thick polyurethane tread firmly bonded to a heavy-duty cast iron core for a quiet, cushioned ride that wears longer than rubber. Polyurethane resists chemicals, oils, and floor debris, and it won't damage floors like solid iron can. The rigid construction of the caster rig ensures steadiness in straight-line transport and stability when used in conjunction with swivel casters for applications where some turning is needed.