This is a Mizuno iron set. It's a 7-piece set including irons 4, 5, 6, 7, 8, 9, and P. I purchased it used and replaced the grips on irons 6-P with new ones, and have been using them. Grip replacement is recommended for irons 4 and 5. The shafts are N.S.PRO 950GH, flex S.