Since double-sided timing belts can transmit power in either direction, they provide more versatility in system design. As a result, the overall size and weight of the system can be reduced as compared to using two separate single-sided timing belts. With 30,000 different SKUs available, we provide high performance belts for machines, agricultural engineering, automotive industry, household industry, etc. Custom sizes and materials are available. To learn more, please visit: https://www.zzr-parts.com/double-sided-timing-belt/ Phone: 734-427-7700