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! The Ultimate Back Pain Bundle includes 3 wheels, a posture corrector and a storage case. Three wheel sizes provide different levels of pressure for customizable back pain relief. Place the wheels in the Storage Case to take back pain relief with you anywhere. Use the Upper Back Posture Corrector to counteract slouching!