Our biggest wheel helps introduce your back to rolling out with a Chirp™ Wheel. This wheel delivers a gentle pressure and a deep stretch for your spine. Say goodbye to tension and back pain every time you roll with the 12" Gentle wheel. How does it Work? Put simply, the Chirp Wheel puts pressure on the muscles surrounding the spine, stretching and strengthening those muscles while elongating the spine. Very good condition, no signs of use.