Ping Zing I have went retro
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The Ping Zings are great clubs ... probably the most forgiving of all the Ping irons, although they got a bum rap because of their looks and the problem some had with the shafts breaking a few inches above the hosel (the original KT steel shafts couldn't handle the toe-down effect during the swing, hence the modified KT-M that are seen in many of the sets today). If you compare the Zings to today's offerings, you'll find them to be solid feeling and very forgiving, but not as long as today's irons (companies have strengthened the lofts on many of today's irons over the years, which accounts for the difference in length). I've got copper Zings with the Aldila 101 graphite shafts as my back-up set, and enjoy these irons very very much.
Good luck with your Zings,
I've done the same thing, just because I like retro golf stuff. Got a set of ping zing berylliums and hit them better than most irons I've hit. I also like the old callaway big berthas. Great feel. I've found, at least for myself, that the irons don't really make much difference in my scoring, but that all have a different feel to them.
For some reason I like the utilitarian, industrial look of the Zings. I have a PING ZING 5 iron and ZING 2 Wedge in one of my bags. I will hit the 5 iron anywhere from 145-165 and especially from crappy lies. The wedge is about an 80 yard 3/4 no brainer and the lie doesn't matter. That wedge is the epitome of "shovel". It could be mistaken for a garden implement.