Comments: Dunlop Grand Prix tennis balls outperform ALL Wilson & ALL Penn balls. After extensive testing of all brands, all models, our indoor leagues, at various venues, have used GPs exclusively for many years. Lasts longer than any other ball on the market. True bounce, durability, higher visibility (20%) are but a few of the many advantages
https://www.tennis-warehouse.com/Dunlop_Grand_Prix_Extra_Duty_Tennis_Balls_24_Can_Case/...