Giant Move AK-H-6" wheel-R 6" Pneumatic Rigid Wheel for Use with Plastic Utility Carts All 4 AK-H Models Rigid pneumatic wheel use for transportation for Giant Move's plastic utility carts, item numbers AK-H models Shock-absorbing; easy to install Wheels are quiet and will not damage your floors Roller bearing wheel absorbs vibrations which could be harmful to load To upgrade your utility cart with pneumatic wheels, purchase and install 2 swivel and 2 rigid wheels