The 10" Firm 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 10" Firm Chirp Wheel+ offers a balance of stretch and massage. Massage the muscles along the spine with a firm pressure while getting a nice stretch for your back.