Golf club makers fell in love with titanium because it's stronger and lighter than steel. The MP-59?, the next generation of our award winning Ti Muscle? Technology, delivers full cavity forgiveness in a player's half cavity design.

While the MP-59 Irons is made from steel, 12 grams of titanium are forged into a pocket behind the face of each club. (It's the slightly darker material in the photo above.) Mizuno says the titanium allows the clubs to maintain the ideal amount of thickness behind the impact area for solid feel while automatically redistributing the weight to the heel, toe and sole of the club.

The Mizuno MP-59 Irons feature a lightweight Titanium insert forged directly into the back of the clubhead. The thicker Ti Muscle material behind impact ensures that the centre of gravity is located closer to the clubface, which allows better players the ability to work shots whilst still offering the forgiveness of the cavity-back design.

In fact, the heads of the MP-59 irons are slightly smaller than last season's MP-58, the first irons released with this feature that Mizuno calls Ti Muscle. Yet Mizuno claims the clubs have a sweet spot that is 5 percent larger.

"The Mizuno MP 58 has a titanium piece that is fairly uniform along the back," says Llewellyn. "On the MP-59 we focused the titanium right in the middle." That should make them perform better on mis-hits than their predecessors, he said.

In short, the MP 59s are the best club that I have ever hit. They are beautiful, inspire confidence at address, and provide crisp and excellent feedback. If you are looking for a new set of irons, I would seriously consider giving them a try.