DETAILS: Challenge your core strength and balance with the GoFit Premium Wood Wobble Board It assists in the development of muscle endurance, increased stability, and is great for lower body rehabilitation A non-slip surface, an easy-to-adjust base, and includes a professionally developed lamented training manual with easy to follow instructions The adjustable base is there for you to increase, or decrease, the difficulty of each exercise to your fitness level-making this the perfect tool for any balance and strength training program Includes Brook Benten Wobble Board Training Manual SPECS: Diameter: 15.5 inches Adjustable Height Range: 3 inches - 4 inches