Price negotiable. Mizuno red mark tennis sponge balls, 30 + 10 bonus balls, for a total of 40 balls. The bonus balls may have more wear and tear. Some balls have dates or writing on them. They will be shipped in a recycled cardboard box! Since Mizuno currently sells 2 balls for 1,100 yen, 30 balls would be equivalent to 16,500 yen. These are popular, so they sell quickly. We recommend purchasing soon after liking the item! Because they are sponge balls, they are light and easy to handle, so they can be used for baseball toss batting practice, toss tennis with children, and throwing practice! Some facilities also use them for grip strength training. I used them for tennis in a gymnasium for about 4 hours, so there may be some wear and tear from the strings, and the degree of deterioration varies depending on the ball, so there may be differences in the strength of the rebound. Please understand that these are used items and there will be differences from new ones before purchasing.