The pulley, which anchors to the top of a door or at any point along a standard door jamb for ease of use, has distinct black marks on the rope to make clinician instructions clearer and patient progress more obvious. By using these black marks, you can now prescribe and progress pulleys the same way you do bands and other progressive tools. Pulley also includes instructions.- Shoulder Pulley, Bulk, Box of 12 Shoulder Pulleys in Individual Poly-Bags, Accompanied by Use & Safety Instructions, 12 ea/cs (023742) (US Only)