The 12" Gentle 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 12" Gentle Chirp Wheel+ offers the biggest stretch of all the wheels and a gentle massage right where you need it. Roll out on this wheel to feel relief from poor posture and muscle tension.