The Mizuno MP-18 irons were designed as a throwback to the muscle-backs of Mizuno’s past. The irons feature 1025E carbon steel with a six times tighter tolerance than industry standard for greater purity. The enhanced Grain Flow Forging process increases grain density in the impact area for the ultimate soft, solid, and consistent feel. The irons also feature Harmonic Impact Technology to deliver ideal impact feel and feedback while the satin nickel chrome finish gives the clubs an elegant, yet durable non-glare finish.