Thank you for viewing. Use: Soft tennis / Soft tennis Type: Non-pressure ball Size: Diameter approx. 7cm, Weight approx. 15g. Product number: 6OH8052P Used for about 1-2 hours indoors in a sponge tennis circle. We select and pack the ones we think are in good condition. There is no core, it's all sponge inside. We think these can be used for children's tennis practice, baseball toss batting, various games for young children, exercise and rehabilitation for the elderly, etc. We try to ship quickly, but We cannot ship on Saturdays, Sundays, and holidays. Thank you for your understanding. ☆ Shipping is by regular mail. ☆ No smokers, no pets.