The Chirp Wheel+ helps reduce back pain by decompressing your spine, strengthening core muscles, and massaging out tight trigger points. Made with a rigid ABS plastic core and soft EVA compression sensitive mat, the Chirp Wheel+ can support up to 500 pounds! Three wheel sizes provide different levels of pressure for customizable back pain relief. The smallest wheel offers the most pressure, to target specific muscle knots, while the largest wheel offers the least pressure and the greatest stretch to help correct poor posture.