Core Balance Wrist Band. 100% Surgical Grade silicone quality Core Balance wristband. Enjoyed by athletes, trainers, sportsmen & everyday people who want better performance while working out or while simply living life. Durable and waterproof it goes anywhere you do. Constructed with a stretch feature that extends easily over your had for ease in taking on/off. Unisex sporty and stylish design with sterling silver accents. Comes in small, medium and large size. Large size: 9" length. Medium: 8". Small: 7". Comes in assorted colors.