What Happened to Penn Foam High Density Training Balls?
 

I loved using these high density foam tennis balls, but I can no longer find them. The alternative foam tennis balls in the market are too soft and can't really be used on a full court. Does anybody know where I can find these or anything comparable?

Thank you

No idea on where to find them. But can you actually play tennis with these balls? How well do they play? From the sound of it a hardcourt would chew them up rather quickly.

I have some gamma foam balls and use them with another hitter as a warmup tool-full swing warm up.