T single-sided and double-sided timing belts are available in pitches 2.5, 5 and 10 mm. Made of polyurethane and reinforced with strong fiberglass tensile cords they are oil and ozone resistant. Fiberglass tensile cords provide many advantages including, high strength, low elongation, absence of creep and excellent dimensional stability. For a lightweight drive system pair these polyurethane timing belts with either aluminum pulleys or plastic pulleys.