1Plastic Materials: The tennis training ball is made of s afe and durable plastic materials, not easy to break or corrode, suitable for long term use, and has good elasticity, which can bring more convenience to your tennis training. 2Tennis with Rope: The tennis balls with string are practical training tools for single practice and they are easy to use, you do not need to spend time in picking up the ball, which can improve your practice efficiency and enhance your tennis skill. 3Improve Multiple Abilities: Tennis training balls are suitable for professional training and daily exercise. They can improve your concentration, athletic ability and hand eye coordination. 4Suitable Object: The tennis ball training tools are suitable gifts for your friends, family members, kids, neighbors, colleagues and other people who like playing tennis at birthday or holidays. 5Enjoy Exercise Time: Tennis training ball are practical and portable, allowing people to enjoy more enjoyable exercise time. You can also use them as pets to play with balls and enjoy relaxing time with your pets.