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