Wobble Board - Fitness and Training Board 13 inch Diameter Notice:This is Inred product,US location shipping and best service ,it is worth for you to buy it. dia 25cm.PP material Therapeutic wobble board, ideal for exercising balance, coordination and responsiveness. The surface is structured in such a way as to provide further sensory stimulation. The balance board helps you enhance your level of functional fitness, develop your core muscles and improve your level of body awareness.