Gaiam Balance Disc/Wobble Cushion Color: Grey Turn almost any chair or seat into an active one by placing the disc on top to add instability and strengthen your core! This posture-improving inflatable 16in balance disc will engage your abs and core muscles when you sit. Great for a meditation seat or whenever you need a little extra cushion. By controlling the firmness of the cushion, you can adapt it to your fitness needs and comfortability. Can also be used to strengthening exercises in or out of your chair. Measurements (Approximate): 16in across In gently used condition. No damage or stains! **Note - this does NOT come with a pump to inflate! Will be inflated when I send out. Comes from a smoke free, pet free home. Bundle to save or make me an offer!