Penn Championship Extra-Duty High Altitude Tennis Balls, 60 ball caseCondition:* New stock, in OEM packaging. Open box. As pictured.* Contains (20x) 3-ball cansAdditional Notes:* Extra duty, high altitude balls perform on hard courts and high elevations* Consistent nap* Controlled fiber release* Natural rubber gives a consistent feel and reduces shock* Durable, interlocked wool fiber* Reduced cracking through deep-elastic seams* Ideal for hard courts* Can also be played on all indoor and outdoor softer, clay court surfaces as well.