The Mizuno MX-900 irons utilize hybrid technology for unsurpassed forgiveness, easy launch, and maximum playability. Maximum performance was thought of when designing this set: the 3-7 irons are Grain Flow Forged, 4135 steel two-piece construction with Hollow Technology, and the 8-PW irons are Grain Flow Forged, 1035 mild carbon steel one-piece construction. That combination helped the Mizuno MX-900 irons hit the 2006 Golf Digest Hot List.