Some thing about Mizuno MP-69

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The new MP-69, the next iconic Mizuno Muscle Back iron, was created by blending our PGA Tour Staff input with the latest state of the art design and simulation tools. This iron is the perfect balance of Grain Flow Forged feel and unmatched workability. The MP-69 irons feature our newly developed 4D Muscle design. A strategic weighting strategy from 3 iron through PW ensures ideal COG placement in every iron throughout the set to deliver total ball control and a predictable trajectory.

4D Muscle design delivers unmatched ball and trajectory control by maintaining the perfect COG design in each clubhead.
Scientifically designed to optimize sound and feel at impact utilizing modal analysis and Harmonic Impact Technology (H.I.T.).
Strategically placed trailing edge bevel delivers tour confirmed performance and increased versatility.
Patented Grain Flow Forged 1025E "Pure Select" mild carbon steel provides the ultimate soft, solid, and consistent feel.
Modified U-grooves, which conform to the condition of competition, produce the ideal spin rate for maximum playability in all conditions.
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Mizuno MX-300 Irons They are also nice club, you can learn of them.