1. Made of natural rubber for consistent feel and reduced shock.2. The bounce height is about 130cm / 4.3 ft, these balls will have the same consistent bounce for the life of the ball.3. Totally blank for autographing or display. The diameter is about 63 mm / 2.4 in.4. Ideal for tennis ball matching and tennis practice.Specifications:Color: Yellow / Black/ Blue/ Red /Pink /Green (optional)Material: RubberItem diameter: 63mm/2.4 inWeight: 58g/ 2 oz (single one) 696g / 1.5 lbs (12 packs)Package size: 21 *14*14 cm/ 8.3 * 5.5 *5.5 inPackage weight: 750g / 1.7 lbsPacking List:12 * Tennis ball1* Storage bagNotes:1.Due to manual measurement, there is a 1-2mm error in the product size. Please specific to the actual.2.The balls from the produced factory are packed tight, so there will be smell after opening the package. After ventilation time, the smell will gradually disappear.About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact usDuring the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shoppingThanks for your cooperation and we'll make you feel satisfied.