Colson 2 series wheel 2.00004.944 4 x 11/4 polyurethane on polyolefin 3/8 Delrin bushing maroon. Features. Maroon polyurethane tread with a gray polyolefin core. Tread is mechanically bonded to core to help prevent debonding. Delrin bushing in wheel. Stainless steel spanner bushing to 3/8 axle sizeSpecifications. Axle Size 3/8 in.. Bearing Size 3/8 in.. Bearing Type Delrin Bushing. Color Red. Hub Length 11/2 in.. Spanner Type Stainless Steel. Wheel Diameter 4 in.. Wheel Diameter Range 4 to 6 in.. Wheel Material Polyurethane on Polyolefin. Width 11/4 in.. Country of Origin United States