Feature: 1. 3pcs balls for a set. 2. Different ball with different grip strength. 3. Spandex outer and TPE core for comfortable grip and quick restore. 4. Squeeze the ball to provide your hands better blood circulation and stimulative grip strength. 5. Fits for reducing physical discomfort and relieving mental tension in your body. 6. Come with a storage bag,easy to store and carry. 7. Great gift for adults,children,students,teachers,elders,etc. Specification: Best relaxing choice for watching TV and boring time. Features: 3pcs balls for a set. Different ball with different grip strength. Spandex outer and TPE core for comfortable grip and quick restore. Squeeze the ball to provide your hands better blood circulation and stimulative grip strength. Fits for reducing physical discomfort and relieving mental tension in your body. Come with a storage bag,easy to store and carry. Great gift for adults,children,students,teachers,elders,etc. Specification: Color: 3pcs Grey / 3pcs Black / 3pcs Blue / Grey&Black&Blue (optional) Material: Spandex + TPE Grip strength: (Grey)40lbs ; (Blue)50lbs ; (Black)60lbs Diameter: 55 mm / 2.2 in Unit weight: approx. 65 g / 2.3 oz Package List: 3* Ball 1* Storage Bag Package List: 3* Ball 1* Storage Bag