Heavy duty case hardened steel yoke incorporates a sealed bearing raceway that minimizes dirt contamination and will out perform them all in both performance and durability. Features. Clean Wheel System MegaCaster. The first caster in the history of the industry to be specifically designed for laundries. NEW 5 tapered polyurethane wheel creates less floor friction and therefore less material build up on the wheel. NEW Dual Sealed Precision bearing system is the best yet for smooth rolling and high performance for years to come. Pack of 4Specifications. Color Gray. Size 5 in.