Say goodbye to back and neck pain with the Chirp Wheel+ 4-Pack. This bundle features four different sized wheels for optimal back and neck pain relief and muscle recovery. The 12” Gentle delivers a wonderful stretch and light massage, the 10” Deep Stretch adds a little more pressure to help you massage those problem areas along the spine, the 6” Deep Tissue digs in deep to get rid of your toughest knots, and the 4” Focus targets key pressure points in your neck to reduce tension headaches and relieve neck pain.