Pro Penn Marathon - Tennis Ball 4 Pack Felt:Extra Duty made using nylon

made using nylon

Balls are 75% slower than normal tennis balls

Gauge: 16 (127)

this string has a surprising amount of touch and feel

mildew or rot while the headband has been lock sewn with 4 rows of 32# white polyester thread and the side and bottom tapes double lock stitched with black polyester thread

Pro Penn Marathon - Tennis Ball 4 Pack Felt:Extra Duty made using nylonPro 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