The Gates Poly Chain® GT® Carbon™ synchronous belts come in longer lengths. A clean and lightweight alternative to roller chain, the belts are used for drives requiring longer center distances and high load carrying capacities. The belts last three times longer than chain, and the sprockets ten times longer. The belts do not stretch, do not require retensioning, and need no lubrication. They are made of a stronger-than-steel carbon fiber tensile cord construction.