Thank you. This is a popular set item recently. It's a W-set product of a soft baseball ball and a hard tennis ball. Shipping costs are reduced compared to buying them separately, making it a great deal. ◆ 30 used soft baseball balls from a batting center, all washed (M-ball size equivalent - the balls in photos 2-6 are the subject of the product) ◆ 15 used hard tennis balls (I don't know the manufacturer, etc.) They were used at a tennis school for about 1.5 months. There is some fine thread debris attached. Photos 7-10 A recent buyer said they wanted to practice fly balls with their child using a knock. It seems that improving fielding skills is essential for their child to become a regular player. However, the father has no baseball experience and his knocking accuracy is poor, so he thought that practicing with tennis balls and a racket would allow him to hit relatively stable fly balls and improve practice efficiency. (It's a touching story) Other uses for the tennis balls include fielding practice and free batting in a confined space. How about adding them to your self-training menu? ※For reference [Hard Tennis Ball Specifications - From Wikipedia] Diameter (mm) 65.4～68.6 Weight (g) 56.0～59.4 [Junior J Ball Specifications - From the All Japan Soft Baseball Federation HP] Diameter (mm) 68.5～69.5 Weight (g) 127.2～130.8 We basically use recycled materials for packaging to be eco-friendly. We will set a plastic bag inside the cardboard box. First, we put the soft baseball balls in, and then put the hard tennis balls on top. Please refrain from purchasing if you are overly concerned about details. Please enlarge the photos, etc., and purchase if you understand. #baseball #softball #softbaseball #practice #used #selftraining #Mball #mball #softball #softbaseballball #softball #youthbaseball