PMI-0065. The Probasics Cervical Traction Set conveniently fits over any standard size door. Ideal for home use when prescribed by a physician or chiropractor, the Cervical Traction Set is designed to relieve back pain or headache due to injury or ailment. The manual traction machine includes a universal, self-adjusting, heavy-duty hanger, a spreader bar, an adjustable velcro head halter and a 20 lb water weight bag.