This 8” Swivel Flat Free Caster is the alternative to air-filled tires. The wheel for this caster is made of a high-density polyurethane material that never goes flat, saving you valuable time, money, and frustration. Tire is ideal for allowing your equipment to move across the toughest of terrains. This is a product that will get your equipment where it needs to go, and with a zinc-plated finish, this caster is meant to last. Also use for trailers, moving dolly's and more.