Feature 1The base is made of quality plastic, sturdy and durable, the bonus rubber rope is highly elastic and wearable 2The base has a valve for putting sand or water into it to increase the weight so as to provide stable support for training 3The small ring on the side is for hanging band, and the concave part for placing tennis ball 4Easy to use and convenient for training without picking ball, lightweight and portable, suitable for many places like garden, park, etc 5Great accessory for tennis training, can help to perfect skills of tennisSpecification Features: 1. The base is made of quality plastic, sturdy and durable, the bonus rubber rope is highly elastic and wearable. 2. The base has a valve for putting sand or water into it to increase the weight so as to provide stable support for training. 3. The small ring on the side is for hanging band, and the concave part for placing tennis ball. 4. Easy to use and convenient for training without picking ball, lightweight and portable, suitable for many places like garden, park, etc. 5. Great accessory for tennis training, can help to perfect skills of tennis. Specification: Material: Plastic + Rubber Color: Blue Base Size: approx.15 * 20 * 5 cm / 5.9 * 7.87 * 1.96 inch Ball Seat Size (Dia): approx. 6.3 cm / 2.48 inch Elastic Force of Ball: approx. 1.2 m / 3.39 ft Elastic Force of Bandage: 4 - 8 m / 13.12 - 26.24 ft Weight: approx. 270 g Package List: 1 x Tennis Trainer Base 1 x Ball with Rope Note:Stopper style is shipped randomly and make sure you will not mind before ordering. .wang-edit-text{ font-family:'Arial' important; } .wang-edit-text table { border-top: 1px solid 000; border-left: 1px solid 000; } .wang-edit-text table td, .wang-edit-text table th { border-bottom: 1px solid 000; border-right: 1px solid 000; padding: 3px 5px; } .wang-edit-text table th { text-align: center; }