DETAILS:

• The product of 100 years worth of testing and perfecting; Penn Championship is the best selling tennis ball in America
• Controlled fiber release provides perfectly even nap, while natural rubber offers consistent feel and reduced shock. The Championship line provides unparalleled consistency every time you hit the court
• 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'
• Penn Championship is the Official Ball of USTA Leagues, so you know you're playing with high quality and consistent ball. Available in extra-duty felt, regular duty felt, or extra-duty high altitude felt. USTA and ITF approved
• Interlocked wool fiber ensures the all courts tennis balls will play like new for as long as possible