5" x 2" Polyflexon Aluminum Wheel Precision Bearing - 900 lbs. Capacity5" x 2" Polyflexon Aluminum Wheel with Precision Bearings The unique flex compound used for the Polyflexon wheels offers a semi cushioned ride, ideal for workshop or warehouse applications where small debris or thresholds are present. The rounded tread and sealed precision bearings provide low friction swivel and roll. These wheels also excel in manual or power assisted towline applications. Tread: Flex Compound Polyurethane Elastomer, Non Marking,