RWM Cast Iron Wheels are extremely long wearing. These wheels provide excellent resistance to shock and are a good choice for heavy loads in manufacturing and warehousing, especially on rough concrete, wood block and other rough surface conditions. Our Cast Iron Wheels are made of much stronger material than inexpensive semi-steel wheels offered by many other wheel manufacturers. These cast iron wheels can withstand high temperatures and exposure to water or the environment, but they will rust over time. Cast iron wheels can also withstand exposure to chemicals, grease, oils, etc.