Cast iron caster wheels are a durable, economical solution for the toughest warehousing and manufacturing applications. Composed of long-wearing gray iron, they resist abrasion, chemicals, shock, and extreme heat. These wheels are best for rough surfaces where floor protection is not a priority. 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.