The Mizuno MP-63 golf iron sets are the newest evolution of Mizuno's widely popular MP range. Based on the success of the MP-62 which is Mizuno's most popular tour iron, the Mizuno MP-63 golf irons are released in the golfing market. The passionate engineers of Mizuno have devoted much time and energy to their research into the sound and feel at impact and the Diamond Muscle Design that debuts in the Mizuno MP-63 proved to be the most popular design in blind testing by Mizuno's tour golfers. The Diamond Muscle Design reinforces the clubhead from heel to toe and offers enhanced feel and ball control.

The sole of the Mizuno MP-63 golf irons are made of the visible grind on the trailing edge and the progressive player's cavity in order to strengthen the precise turf interaction which delivers the shot versatility and ensure the playability in the long irons respectively. After Mizuno studied vibration simulations of the head and experimented with several methods of affecting the sound and feel at impact, the mizuno mp 63 provide the ultimate soft, solid, and consistent feel. Moreover, numerous new concepts have been blindly tested by Mizuno's tour team, including Luke Donald. After the testing, they can make sure to release the Diamond Muscle Design, which reinforces the head from heel to toe, was the clear winner.