As the name implies the ZX5s are the second version of their MainFrame technology which is a pattern of voids areas and grooves milled into the back that increases the club forgiveness and improves face flex. The sole is the Tour V.T. profile with added bounce on the leading edge which assists the head to pass more cleanly through the turf. A set of seven irons with steel shafts is $1200 and with graphite shafts $1300.
https://us.dunlopsports.com/srixon/clubs/irons/zx5-mk-ii-irons/zx5-mk-ii-irons/MZX5MKIIIRN.html
