Product Description: Finger training balls are easy to put in your pocket or bag. You can use it while walking, traveling, at the office, at school, watching TV, or anywhere else you want to exercise. Post-motion rehabilitation for all fingers, thumbs, hands, wrists, carpal tunnel, forearms and elbows, increasing strength and range of motion, is your super easy hand strength training. Product Specification: Material: TPR Size: 12.3cm*9.3/4.8in*3.6in Color: Blue Package Includes: 1Pack x Hand grip exerciser strengthener