This is the extra-large 12" Chirp wheel that was only used a couple times as it was too tall for my senior parent and hard for them to get up and down off of. Chirp wheels have a little canal in the center that allows your spine to slip into so it can stretch the muscles on either side. 11mm sturdy foam makes the wheel comfortable and keeps you steady.

Reduces back pain
Improves flexibility
Corrects posture
Thick cushioning for comfort
Spinal Canal™ protects the spine from pressure

Note: Slight indent on one tiny area but does not affect functionality at all. (See photo)
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OBAYMID