Pro Penn Marathon Extra Duty 24 Cans

This is the best playing most durable ball there is

Simply THE BEST!!!

Have love using these Tennis balls and will continue. Long lasting and good quality.

These balls last more than one session, potentially more than two but they are much firmer and stiffer because the core is thicker than on most balls. It's noticeable and while not a deal breaker, I think I prefer the feel of Dunlop ATP Extra Duty balls. I can see these balls giving those with elbow issues problems since they are so firm. Overall they're better than a lot but my club uses them in their ball hoppers and that's likely because they hold pressure so long but are firmer as a drawback.