The Mizuno MX-900 iron is not only the most Hi-Tech iron Mizuno has ever produced, but it also delivers unbelievable Game Improvement performance for mid to high handicappers. The MX-900 irons utilized Hybrid Technology for unsurpassed forgiveness, easy launch, and maximum playability. The MX-900’s are the first set of Grain Flow Forged Hybrid irons in the industry. They have grain flow forged 4135 high strength steel for the 3-7 irons in the face and neck for a more solid, consistent feel, and maximum durability and grain flow forged 1035 high select mild carbon steel in the 8-PW irons for soft, solid, consistent feel. The 3-7 are forged with Hollow Technology for easy launch and maximum forgiveness, 8-PW are one-piece forged for ultimate feel and control in the scoring irons. H.E.M.I. (High Energy Mass Impact) Hybrid COG (3-7) technology utilizes a 12g tungsten weight that positions the COG low and deep for maximum energy transfer and playability. Two piece hollow technology head construction (3-7) utilizing a CNC milled face with plasma welding which ensures precise COG placement. CORTECH face design utilizes three distinct face thicknesses to deliver consistent distance control and feel. A Durable Double nickel chrome plated finish and U-grooves produce the ideal spin rate for maximum playability in all conditions. They also have a super forgiving, extra wide sole to increase ease of launch and deliver consistent ball striking ability from all types of lies.