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Meet the Pro Penn Marathon Extra Duty: Penn's longest lasting tennis ball. Featuring an Encore™ core and LongPlay® felt, these tennis balls last 22% longer than average. For extended play sessions on hard courts, the Pro Penn Marathon Extra Duty is an excellent choice.
Pro Penn Marathons are definitely a step about the regular Penn balls. They do hold up better and last longer. Worth the extra cost when you order 24 cans.
no damage. as advertised AND was actually cheaper than amazon - don't support amazon and contribute to billionaire Jeff Bezos's corrupt capitalistic business! order from here and feel better about what you support!
Just wish they were less expensive.
I thought I would give these balls a try. They are harder than the US Open balls. They seem to last longer than the Wilson balls.
These balls are great - last MUCH longer than store-bought balls.