Mizuno MX-300 is designed to conform to the 2010 Condition of Competition rule.
 

The new Grain Flow Forged MX-300 irons with Y-TUNE PRO technology are the perfect players spec mizuno irons with enhanced game improvement irons technologies. The head specifications of the new MX-300 irons provide a more traditional look with a minimal progressive offset, a compact head size and modest sole width to deliver the look for an aggressive player profile.

The full cavity utilized in the MX-300 irons contains the reconfigured Y-TUNE PRO technology for enhanced feel and ball flight control, with added forgiveness. The milled pocket cavity (3-7) redistributes 12 grams of discretionary weight low and deep to provide a high penetrating launch, while the scoring mizuno irons (8-GW) utilize a solid power bar design for maximum solid feel and pin attacking control. The MX-300 irons are the perfect weapons for the player looking for the combination of feel, forgiveness and ball control.
 

The full cavity utilized in the MX-300 irons also contains a reconfigured Y-TUNE Pro technology for enhanced feel and flight control. The milled pocket cavity (3-7) redistributes 12 grams of golf clubs for sale weight low and deep to provide a high penetrating launch, while the scoring irons (8-PW) utilize a solid power bar design for greater workability.

Mizuno offers the MX-300s in a standard array of lofts, ranging from a 3-iron, all the way up to a gap wedge, though the standard set runs 4-iron through 52° gap wedge. The stock shaft is the True Temper Dynalite Gold XP, in either the R300 or S300 flex profiles, and is a lighter, higher launching shaft than the Dynamic Gold.

Mizuno player Stacy Lewis' bag:

Irons: MX-300
Drivers: MP-600, 8.5 Degrees, 45
Utility: MP CLK 17&23 degree, 
Fairway: MP Titanium 15 degree
Wedges: MP T-10 White Satin 52,56,60