CanDo Wobble Board Round 16 Inch, 3 Inch Height, Advanced Improve ankle range-of-motion, balance, body awareness, and develop joint mobility and reaction skills Balance board is durable, heavy-duty, and non-skid The balance boards are made of a strong but lightweight plastic for portability Balance Board 16 inch diameter 3 inch height - advanced CanDo - the inexpensive alternative to Theraband