Diadem Premier Extra Duty - Case

I use the tennis balls to practice serving. So far I have used them for 3 days and they are retaining the pressure very well. I used them today for the fourth time and will now re-pressurize them for 48 hours. Based on my using the balls for practicing my serve only and re-pressurizing them after a fourth use the balls should last me until the end of September. Thank you. I love these tennis balls.

Longer Lasting Than WIlson US Open

In my opinion, even after 4 sets, Diadem Premier Extra Duty tennis balls bounce better than Wilson US Open extra duty balls after 4 sets on indoor courts. It's my new go-to tennis ball!

Great quality, great price

Great quality balls for a very reasonable price. I think these perform pretty on par with the Wilson US Open balls, which are my bellwether for "top notch quality." The Diadems don't fluff out after hard hitting, and can last several sessions keeping their firmness. My go-to ball now!