Yosoo Round Wobble Balance Board Stability Disc Yoga Ankle Knee Rehab Exercise Gym Fitness Training Board-14 inch Diameter Plastic round wobble board for home exercises Helps to strengthen and stabilize your ankles, knees, core and shoulders Improves balance, coordination, stability and agility. Great replacement for people who found it difficult to balance on an exercise ball Ideal for yoga or regular workouts and a wide range of rehabilitation exercises Dimensions: 14-Inch diameter;Color: Black