These stringed tennis balls are a great way to practice your swing at home or on the go. With two balls connected by an elastic cord, you can work on your form and footwork without a partner. The cord allows the balls to rebound off each other as you volley back and forth, simulating a real game. Each set comes with an extra-long 3-meter rope so you have plenty of room to maneuver. The netting contains the balls securely while letting them bounce naturally. Lightweight and durable, this trainer device lets you focus on your technique anytime, anywhere. It's perfect for all skill levels from beginners to seasoned players looking to stay sharp between matches.