Dunlop Grand Prix Extra Duty Tennis Ball
I think they are great . My new brand . I was playing with a group on two courts side by side . One court using my can of Penn Extra Duty balls and the other court using these Dunlop balls who anther fella supplied. Both cans brand new. After 2 hours of play I compared the Penn vs Dunlop . The Dunlop was in much better shape . More bounce, etc… So when I went home I ordered a case of Dunlop balls. Fabulous.