6"×2" Flat Free Caster Wheel Benefits 1. Using the 6"×2" flat free caster wheel wheels, there is no need to deal with deflate or inflate tires. 2. Puncture free, microcellular polyurethane replaces the air in flat pneumatic tires. 3. Lightweight, it is easier to handle your equipment. 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. The 6"×2" flat free caster wheel wheels are shock absorbing. 8. It is ideal for trucks, trolleys, tool carts, barrows, lawn mowers and many other applications.