The Chirp Wheel+ includes three different sizes of Chirp Wheels to help relieve back pain, target knots, and reduce headaches. Simply choose from one of the three sizes of Chirp Wheels and with only five minutes of rolling, you'll feel incredible relief. With foam padding and a patent-pending Spinal Canal^TM, the Chirp Wheel is comfortable for a variety of different users. Feel the relief and sleep better with the Chrip Wheel+ 3-Pack of rollers.