The Dunlop ATP High Altitude Extra-Duty 24 Can case features tennis balls officially endorsed by the ATP World Tour. These tennis balls are specifically designed for playing at high elevation.

• 3 balls per can.
• Suitable for play on hard courts.
• Approved by the USTA and ITF.

Important Note: These tennis balls are designed for use in high altitude locations over 3.000 feet. They will not work as well and seem dead or flat in other locations.