New from Motonica are these optional pulleys for the P81/ P8F cars, made in Kevlar material. The new material allows for a smoother movement of the transmission system while minimizing friction. The smaller pulleys are sold in a set (16T, 18T, 22T, 24T, 25T), while the 50T and 51T versions are sold separately.

Source: Motonica [motonica.com]