Similar to above, but pulleys in plastic with bearing to minimize friction, mounted in tandem on sheet metal strip with hooks on either side for suspension and loading. Open sheet metal frame painted with scratch-resistant epoxy coating. Accurately centered. Pulley configurations available are 

M13559/1 Double Tandem (Long) — one pulley each of diameter 50 and 38mm mounted in line M13559/2 Triple Tandem (Long) — one pulley each of diameter 50, 38 and 25mm mounted in line