The Balance Board is the perfect tool to help you improve your balance and coordination, increase your leg strength and ankle range of motion, enhance your core, lower and upper body strength and stability, avoid injuries and improve overall posture. Includes a smooth and lightweight roller, which reduces vibration and sound. Full freedom of movement without tracks or grooves. Board Size: 10" (26cm) x 31" (80cm). Roller Diameter: 4" (11cm).