Pro Penn Marathon - Tennis Ball 4 Pack Felt:Extra Duty use the Luxilon ALU Power

use the Luxilon ALU Power Rough in the mains

The customizable vibraton dampener used by Rafael Nadal

Fabric: 91% Nylon/9% Lycra

The Luxilon Elite Dry overgrip offers exceptional sweat absorption while providing a comfortable feel

Gauge: 16 (127)

Pro Penn Marathon - Tennis Ball 4 Pack Felt:Extra Duty use the Luxilon ALU PowerPro Penn Marathon is Penns longest lasting tennis ball featuring exclusive Encore Technology for a 22% longer lasting core and high tenacity LongPlay Felt for extended play. Pro Penn Marathon is the official ball of PTR because of its guaranteed longevity, durability and visibility. Pro Penn Marathon is available in Extra Duty Felt (for hard courts), Regular Duty Felt (for soft courts) and Extra Duty High Altitude (for higher altitudes). Penns