Multiple inputs/outputs of the rollers/shafts of many exact and complex ratios are possible. Size is not a limiting factor.

Offset	Fig. 53
Stepped (Link: Scrollers in scrollers, pulley	Fig. 54
Multi (Link: Combinations)	Fig. 55

(Link: Rollers, size)
(Link: Flexible hollow rollers)

Note: outer-sleeve/housing is optional when creating ratios.