4 Packs Tennis Training Ball with String Tennis Trainer Balls Self Practice Trainer Tool Tennis Ball Training Equipment for Tennis Trainer Practice Exercise

Package included: you will get 4 packs of tennis training balls with string, enough quantity for your daily training use and replacement, you can also share them with other people
Reliable material: the tennis trainer balls are made of safe and durable materials, not easy to break or corrode, suitable for long-term use, with nice elasticity, they can bring much convenience for your tennis training