The Grand Prix Regular Duty Tennis Balls provide consistent performance for tournament-style play on any surface. Enhanced with a premium woven felt for brighter visibility and our specialized rubber core for unmatched feel, the Grand Prix All Surface tennis balls are perfectly suited for tournament play. provide consistent performance for tournament-style play on any surface. With the Grand Prix All Surface tennis balls from Dunlop, consistent performance comes standard. Enhanced with a premium woven felt for brighter visibility and our specialized rubber core for unmatched feel, the Grand Prix All Surface tennis balls are perfectly suited for tournament play. 3 balls per can.