8"×2.50-4 Flat Free Caster Wheel Benefits 1. Puncture free, microcellular polyurethane replaces the air in flat pneumatic tires. 2. Lightweight, it is easier to handle your equipment. 3. Long lasting - this tire could outlast the lifetime usage of your equipment. 4. Air free, you don't worry about low air or blow up a tire. 5. The 8"×2.50-4 flat free caster wheel wheel reduces costs and efforts spent replacing tires. 6. It has no Pb, Cd, Cr or other substances hurting the environment or the user's health. 7. The 8"×2.50-4 flat free caster wheel wheels are shock absorbing. 8. It's ideal for trucks, trolleys, tool carts, barrows, lawn mowers and many other applications.