Type... Non-pressure ball Uses... Soft tennis / Soft tennis Thank you for viewing. Uses... Soft tennis / Soft tennis Type... Non-pressure ball. Size: Approximately 7cm in diameter, weight: approximately 15g. Product number: 6OH8052P Used for about 1-2 hours indoors in a sponge tennis circle. Selected and packed with what I consider to be in good condition. There is no core, it's all sponge inside. I think it 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 very much. ☆ Shipping is by regular mail. ☆ No smokers, no pets.