This lumbar back stretcher is made of durable ABS material and environmentally friendly NBR material. Its rear stretcher device can support up to 250kg weight. This back massage stretcher has 88 plastic needles that you use to stimulate your back to relieve back pressure and return the spine to normal alignment as well as help improve flexibility in the shoulder muscles. This stretcher can be adjusted to a total of 3 levels of height so you can choose the most suitable and comfortable height to stretch your back and relieve stress.