Dunlop Grand Prix Extra Duty 24 Cans

Tennis ball

Great tennis balls!!!

These balls are definitely more durable than Penn Extra duty balls. As such, they will work well with my PongBot tennis ball machine for both solo exercise and tennis instruction. The Dunlaps are sturdier than the Penn's which takes some getting used to. They aren't nearly as hard as the old Tretorns but I could see them causing some players a slightly sore arm.

Great balls!

These are excellent balls to train with. They will last a lot longer than most other balls on the market and a lot of tournaments even play with these balls now. The only negative is they are bit on the heavy side, so if you have arm problems you might want to get something a bit lighter.