Penn High Altitude Tennis Balls are specifically designed for play at elevations above 3,500 feet. This 20-pack contains tennis balls engineered with a unique pressurization to perform optimally in high-altitude conditions where standard tennis balls tend to bounce too high and play too fast. Each can contains 3 balls for a total of 60 balls across the 20-pack.

Penn high altitude balls feature reduced internal pressure compared to regular tennis balls, compensating for the lower atmospheric pressure at elevation. This ensures consistent bounce height and playability in mountainous regions and high-altitude courts. The balls maintain Penn's championship-quality felt covering for durability and consistent performance across multiple matches.