Features: 1. Made of natural rubber for consistent feel and reduced shock. 2. The bounce height is about 130 cm / 4.3 ft; these balls maintain consistent bounce performance throughout their lifespan. 3. Smooth surface ideal for autographing or display. Diameter is approximately 63 mm / 2.4 in. 4. Suitable for tennis ball matching and practice sessions. Specifications: Color: Yellow / Black / Blue / Red / Pink / Green (optional) Material: Rubber Item diameter: 63 mm / 2.4 in Weight: 58 g / 2 oz (single ball) Total weight: 696 g / 1.5 lbs (12-pack) Package dimensions: 21 x 14 x 14 cm / 8.3 x 5.5 x 5.5 in Package weight: 750 g / 1.7 lbs Packing List: 12 x Tennis ball 1 x Storage bag Notes: 1. Due to manual measurement, there may be a 1–2 mm size variation. Please refer to the actual product. 2. Balls are packed tightly at the factory and may have an odor upon opening. The smell will dissipate after airing out.