Im about to buy a set of Nike Slingshot irons and can't decide whether to go with graphite or steel shafts. i know what flex I would want with the Steel shafts but with graphite there are two choices, reg flex low-kick, and reg flex mid-kick. I have no idea what those two mean so if anyone could help me out id appreciate it. I may just end up going with the steel shafts with reg flex but please help lol because I'm going to be buying them with in the next few days.