A little neat thing to check out is Fairway Golf’s “Evolution of the Ping Irons” display case. This case has the following clubs: Karsten 1: 1969, Eye: 1979, Eye2: 1982, Eye2: 1983 Beryllium Copper, Zing: 1992, Zing2: 1994, ISI NIckel: 1996, ISI:1997, i3 O-Size: 2000, i3 Blade: 2000. Great display of how Ping has changed not only their irons, but helped influence the golf world with innovation and technology. Enjoy the pictures.