Although urethane bumpers are being made in gray and black, yellow bumpers are always urethane. If you see the symbols PUR, or RIM on the bumper, or you have determined that the plastic is indeed urethane, this is the rod you need. This polyurethane rod measures 400 ft. (122 m) long and 1/8th inch (3 mm) in diameter and works with Urethane Supply Company's Airless Plastic Welder. If you are a high volume user of polyurethane welding, you may want to consider this 400 foot (122 meter) roll. This rod is packaged on a spool.