Max-Duct™ is manufactured with triple foil laminate with a very durable white PVC and UV inhibitors. Max-Duct™ is the strongest duct on the market and with a cost similar to the leading competitors 3 ply ducting. Available in 4"–20" all rolls are 25ft. each roll comes with 2 duct clamps. If you want the Maximum Duct… reach for Max-Duct™.