Pro Penn Marathon - Regular Duty - Tennis Ball Case Felt:Regular Duty Wilson Synthetic Gut Power has

Wilson Synthetic Gut Power has a consistent

Material Construction: Co-polyester with polyamide coating

Length: 360 feet / 110 meters ( approx

Material Construction: Multifilament / Polyurethane / H2C fibers / Biphasic treatment

A firm polyester with lots of access to spin makes this a great string for hard

Pro Penn Marathon - Regular Duty - Tennis Ball Case Felt:Regular Duty Wilson Synthetic Gut Power hasPenn's longest lasting tennis ball, the Pro Penn Marathon feature Penn's Encore technology for more longevity in the core and LongPlay felt for better durability. Optik felt keeps visibility at a maximum. Regular duty for indoor or clay courts. 3 balls per can 24 cans 72 balls