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Poly-V belts are drive belts with a much larger contact area than flat belts or standard V-belts, which means they are able to transmit more power than a flat belt of a similar size. This means that they are excellent when you require high speed drives within a small space. There is no need to use a stepped pulley if you use a poly-V belt, you can also drive several accessories from one belt drive if you use a serpentine belt installation.