https://www.optibelt.com/en/products/v-belts/optibelt-vario-power/
The base compound consists of a polychloroprene rubber compound with reinforcing fibres inlaid transversely to the running direction. The high quality and extremely low stretch polyester or aramid tension cord is embedded in a cushion compound. It is reinforced with a fabric outer surface, and the transverse fibres incorporated provide transverse rigidity without sacrificing flexibility.
