Penn Championship Extra Duty High Altitude Tennis Ball Can, 3 Balls

ALL HIGH ALTITUDE COURTS: Extra duty tennis balls can be played on hard court matches and on indoor and outdoor softer, clay court surfaces as well. Please note that Penn high altitude tennis balls are intended for elevations of at least 4000'. LASTING DURABILITY: Interlocked wool fiber ensures the all courts tennis balls will play like new for as long as possible. International products have separate terms, are sold from abroad and may differ from local products, including fit, age ratings, and language of product, labeling or instructions.