Item Name: Rebound Exercise Self-study Baseboard Practice Ball with Rope Tennis Trainer. Ball Seat Size (Dia): approx. 6.3cm / 2.48 inchBase Size: approx.15 * 20 * 5cm / 5.9 * 7.87 * 1.96 inchElastic Bandage: 4 - 8m / 13.12 - 26.24 ftMaterial: Plastic + RubberColor: BlueElastic Ball: approx. 1.2m / 3.39 ftPackage included: 1 x Tennis Training Device kit set *( board + ball)