KYOEI Golf Iron KK MB 4 to P

Two years of development went into lowering this blade's center of gravity — without giving up what a muscle back is supposed to feel like.

The KK MB is built on an entirely new mold, separate from Kyoei's KK CB and Dual Weight II — despite the three sharing a release year, this is not a shared casting with cosmetic differences. The original handmade MB prototype performed well, but Kyoei rebuilt the mold from the ground up to push the center of gravity lower, producing what the brand considers its most forgiving muscle-back blade to date.

Each head is single-piece forged from S20C Japanese steel, then finished with computer-controlled milling across the face, grooves, logo stamp, and back cavity — soft forged feel at impact, with the face and groove consistency that only CNC precision delivers.

All three heads in this generation share Kyoei's 5-Cut sole grind, refined over years of iteration to balance sole width, leading edge, and trailing edge angle. The result is a sole that reads well for both sweepers and diggers — a genuinely wide window of swing types rather than a grind tuned for one type of strike.