●Rubber Material: Made of premium rubber material, this ball is strong and possesses long service life. ●Easy to Use: You can open the watch case easily with this ball and with no scratches left, very convenient! ●Screw Ball Design: Adopts unique screwing ball type design, this is an inflatable ball, space saving and practical. ●Easy Carrying: Comes with small size and lightweight, you can easily take this ball with you to help with your work. ●Ideal Choice: This little rubber ball can help you change watch batteries yourself, no extra expense necessary, take it home!