This back massager was made by very tough ABS plastic, equip with different settings to completely stretch and relieve lower back pain. Just use for 5 minutes, twice a day for optimal results. It is designed to stretching your back easily, safely, affordable, and enjoyable. It is used to help relieve the chronic back pain, correct postural imbalance, restore the natural curvature of the back and improve the flexibility of shoulder and back muscles. Adjustable, there are 3 different levels, just choose the one that fits you the most, put it on the floor, bed, or even put it on a chair.