regular duty tennis balls
            
            Regular duty tennis balls represent the standard choice for indoor court play and controlled environments, designed with specific characteristics that enhance performance in these conditions. These balls feature a needle-felt wool-blend exterior covering a hollow rubber core, manufactured to precise specifications that meet international tennis regulations. The felt covering is carefully calibrated to provide optimal friction and bounce characteristics, while the internal pressure is regulated to ensure consistent performance. Regular duty balls are distinguished by their slightly thinner felt composition compared to their heavy-duty counterparts, making them perfectly suited for indoor courts and smoother surfaces. They maintain their shape and playing characteristics effectively under controlled conditions, typically lasting between 4 to 6 playing hours before showing significant wear. The balls undergo rigorous quality control processes to ensure uniformity in size, weight (56.0-59.4 grams), and bounce height (135-147 cm when dropped from 254 cm). These specifications contribute to their reliable performance in tournament play and recreational use on indoor courts, making them the preferred choice for controlled environment tennis.