These balls tend to be discounted in many stores below $2/can on sale. They have a very firm rebound off the racket (not the best for people with elbow problems), inconsistent felt seam, causing sometimes unpredictable bounces. On the other hand, they do seem to retain pressure as well as most others. Probably OK as a cheap practice ball if you can get them cheap, but don't used them for official match play. The felt life is fairly short when compared to Wilson US OPEN or Penn Pro balls. I used two cases for my tennis team this season. I will keep searching for a better affordable practice ball