This is a topic I had been wondering about. Ever since becoming an owner, I've switched out to the Silver Jets . . . but they can't be the only good balls on the market. (No magnets here, so far.) A visual inspection on these things does not immediately show me much. One SJ ball put in fairly recently has started to make some noises that concern me, as it rolls around a vintage EM playfield. I'd like to have a better guide on what needs replacing and when. The five balls in my manual loader EM have probably been in there for years and years, but could be hard to get to (?). They still look O.K., at a casual glance.

I don't think I've ever seen any by that name being sold, anywhere . . . ?

I hear you, and I'm sure you must be right, but then I can't explain the case of my Cross Town, whose 5 balls must have been in there for WHO KNOWS HOW MANY YEARS at the time that I bought it. And I still can't see anything wrong with them ! But I suppose I could change them out anyway. That pin is in storage for now, and so has not gotten much play.