Mizuno's carefully selected black mark sponge balls. Regular price: 660 yen per ball x 12 balls = equivalent to 7920 yen. Used indoors for about 3 hours. Although there are some chips and dents on the surface, I think they can be used for tennis practice, baseball toss batting, and various games for children and the elderly. Please purchase if you understand that these are used items. No price reduction is possible as this is an item from a club.