Feature●【Elastic Black Rope】The elastic black string with the ball helps to draw the ball back when you hit it far. It is 4 meters long and you have enough space to play. You can replace the string separately.●【High Quality】The surface contains 25% wool, and the middle layer is a wear-resistant layer, as well as the inner tank is a latest upgraded rubber, which make this ball better quality.●【56.7-58.6 Grams】The ball weight is suitable to bounce between 2.35 meters and 1.47 meters when falling from a height of 2.54 meters.●【1Ball】This is one ball link for the solo tennis trainer to provide more replaced balls for your practice.●【Customer Service】If you have any problems to use this ball, please click contact seller besides your order. We provide 7X24 customer service for you.Description