Dual Hi-Performance Pd™ belts have precision teeth on both sides improves efficiency with dual synchronous belts, this design allows more sophisticated, more efficient and more compact drives where a single belt is needed to provide accurate timing from either side, rotation direction changes or both. Dual Hi-Performance Pd™ belt can replace two or more single-sided synchronous belts, less space is needed. This reduction in space means smaller sprockets can be used, bringing the weight and component cost of the drive system down considerably, contributing to a more efficient drive system. They drop into corresponding 8 or 14 mm HTD sprockets. ContiTech Dual Hi-Performance Pd® Synchronous Belt, 180 Teeth, 8 mm Pitch, 1440 mm Overall Length, 20 mm Width, -40 to 71 °F, HTD® Tooth Profile, Chloroprene with Fiber, Fiberglass Reinforced, Black