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, approximately 15g in weight. Used for about 1-2 hours indoors in sponge tennis circles. We have selected and packed what we consider to be 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 strive for prompt shipping, but We cannot ship on Saturdays, Sundays, and holidays. Thank you very much. ☆ Shipping is by regular mail. ☆ No smokers, no pets.