Description: Tennis with string: a practical training tool for single practice, easy to use, no need to spend time picking up the ball, improve practice efficiency and improve tennis skills. Material: High quality PU polyurethane material, soft to the touch, not easy to break, good elasticity, suitable for long term use. Easy to carry: very light, practical and portable, allowing people to have a more enjoyable exercise time. Versatile Use: Ideal for professional training and daily exercise, it improves your concentration, motor skills and hand eye coordination. Perfect Gift: Tennis training balls are perfect for friends, family, kids, neighbors, colleagues and anyone who loves to play tennis. Specification: Material: PU Polyurethane Size Chart: Ball: Diameter 7cm/2.76inch Rope length: 3m/118.11inch, diameter 1.2mm/0.05inch Package Includes: 1 Piece Tennis Training Ball (4 Pack) Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. Wish you a wonderful online shopping!