These casters wheels feature a strong cast iron core and a thick rubber tread that ensures a smooth, quiet ride. Rubber may mark floors and pick up small debris, so this caster is a good choice when low costs, quiet operation, and load cushioning are prioritized over floor protection and longevity. 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.