* The MP-52, like its big brother MP-62, is a sharp departure from the "Cut Muscle" MPs (32, 57, 60, and 67). Though it sports a similar name in "Dual Muscle," it's really a different animal. The Dual Muscle technology gets its name from (appropriately enough) two new design features: an outer "muscle pad" that, according to Mizuno, moves the center of gravity lower and deeper to enhance playability and launch angle; and an inner "muscle pad" that is intended to provide the feel and the feedback that better players tend to seek.

* The MP-52s feature dual CNC-milled pocket cavities behind the face in the 3- through 7-irons. These two deep crescents allowed the designers to move 14 grams of mass to lower and deepen the COG further. These cavities look like they would hold two quarters each. Mizuno has opted for this dual crescent approach in an effort to maintain a solid feeling impact zone while bringing more forgiveness to its MP line.

* Mizuno is known for its forged irons, and the MP-52s are intended to continue in that tradition. The clubs are "Grain Flow Forged" (Mizuno's term) from 1025E mild carbon steel, which is then finished with double nickel chrome plating for looks and durability. Mizuno has given the MP-52s modified U-grooves. The rolled leading edge, cambered mid-sole, and agressively beveled trailing edge are designed to give the irons more playability from all types of lies while remaining true to their MP lineage.