MP-30 Irons The new MP-30 1025 select mild carbon steel provides superior feel. Progressive half-cavity design maintains solid feel while offering more playability in the long irons and more workability in the short irons. Rolled leading edge, cambered midsole, and beveled trailing edge delivers consistent striking from all types of lies. Modified U-Grooves produce the ideal spin rate, for maximum playability in all conditions. Durable double nickel chrome plated with mirror finish. True Temper Dynamic Gold S300 steel shafts are standard.