I have all kinds and sizes of chop cups, and recently bought the Harmonica cup. I was having a real
difficult time finding a chop cup ball that would work with it. Most of the ones out there were too
heavy or just don't stay. The Leo Smetsers balls work perfect. I am getting more sets just in case
they run out. Also, the spectators when they see a miniature baseball seem to understand the
routine better for some reason.