Improve tennis skillsGreat accessory for tennis training, can help to perfect skills of tennis, but also could improve your concentration, athletic ability and hand ;eye coordination, and develop interests of sports. Stable Baseboard The base has a valve for putting sand or water into it to increase the weight so as to provide stable support for training. Durable and PortableThe base is made of quality plastic, sturdy and durable, the bonus rubber rope is highly elastic and wearable. Fine design The small ring on the side is for hanging band, and the concave part for placing tennis ball. Easy to Use convenient for training without picking ball, lightweight and portable, suitable for many places like garden, park, etc. color: blue Size: base about 20*14*5.5CM Delivery Quantity: 1 Piece