Unlike imitation products that break easily, Back Stretcher Support is designed to last, using thick hi tech ABS plastic for durability and longevity. Magic Back Support also comes with complete written directions, a chair strap for when using as lumbar support. The unique thumb tip nodes on the arch, feel as if you're getting lightly massaged as your stretching. Adjustable lumbar stretchers are safer then inversion tables, and more effective then foam back stretchers. The arch on foam back stretchers are not adjustable which limits your ability to improve your flexibility.