Features: Made of natural rubber for a consistent feel and reduced shock. The bounce height is about 130 cm / 4.3 ft. These balls will maintain the same consistent bounce throughout their lifespan. Totally blank for autographing or display purposes. The diameter is approximately 63 mm / 2.4 in. Ideal for tennis ball matching and tennis practice. Specifications: Color: Yellow / Black / Blue / Red (optional) Material: Rubber Item Diameter: 63 mm / 2.4 in Weight: 58 g / 2 oz (single ball) 696 g / 1.5 lbs (12 packs) Package Size: 21 * 14 * 14 cm / 8.3 * 5.5 * 5.5 in Package Weight: 750 g / 1.7 lbs Packing List: 12 * Tennis Balls 1 * Storage Bag Notes: Due to manual measurement, there may be a 1-2 mm error in product size. Please refer to the actual product for accuracy. The balls are packed tightly from the factory, so there may be a smell when the package is first opened. After ventilation, the smell will gradually disappear.