8"×2.50-4 Flat Free Caster Wheel Benefits 1. Lightweight, it is easier to handle your equipment. 2. The flat free pneumatic caster reduces costs and efforts spent replacing tires. 3. Puncture free, microcellular polyurethane replaces the air in flat pneumatic tires. 4. Long lasting - this tire could outlast the lifetime usage of your equipment. 5. With easy rolling you can do the same job with less effort. 6. It has no Pb, Cd, Cr or other substances hurting the environment or the user's health. 7. It's ideal for trucks, trolleys, tool carts, barrows, lawn mowers and many other applications.