Chirp Wheel + 3 Pack 6467427Your back pain has never been easier to fix. The Chirp Wheel is designed to fit perfectly between your shoulder blades, targeting the muscles that go up and down your spine. As your back is strained from the countless activities you do, those muscles lock up and cause even more pain. The Chirp Wheel massages those muscles, relaxing your back and relieving all of the pain. Features & Benefits Built Strong Rigid ABS plastic core and supports up to 500