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