Pros: These are not fake balls like the ones sold at m****l's for $40 per 25 plastic outered baseballs.. These are real ones you use in your everyday baseball lives, in games, practices, you name it... These are the ones you should get.
All of the academies use diamond baseballs also.
So if you want to be one of the best, get used to the ball you use in games, and buy this product