Mizuno Pro 245 irons / Official R&D Summary

Tour Speed and Launch: The Mizuno Pro 245 is measurably quicker again from the face than the Mizuno Pro 243 but also easier to launch – due to a complex hollow body construction and internally suspended Tungsten weight. Packed into a staggeringly sleek chassis, the Mizuno Pro 245 showcases more than any model how rapidly Mizuno’s Grain Flow Forged process has evolved.

Yeah the mauno pro 245 th this is a model where we’re trying to infuse as much technology as we can but have it look like this when you look down at this or you look at the look at it in the bag this is very much a muscle back look larger

Than a muscle back obviously but there’s been care taken in terms of the size and shape the head the Top Line the width of the sole um this is not an oversized Golf Club it is larger than a muscle back uh but it’s still a player iron

It’s a player’s iron that has an awful lot of ball speed and an awful lot of forgiveness but it’s all hidden actually with the Muno Pro 245 there’s one thing that we did cosmetically different than the 241 and the 243 on those models the the model number is actually on the hosle whereas

Because this looked so much like the muscle back 241 we actually laser and grade the 245 on the back of the head so that it’s easily identified as the 245 uh on the outside visually this is uh looking a lot like a muscle back but um when you look at how it’s actually

Constructed um we start off with a 4135 chrom o uh grain flow forged face and neck uh you can see the multi thickness design here you can you can really feel how thin the face is uh the 4135 material being the strongest in our toolkit of materials for our

Grain flow forging process we’re able to go very thin uh and this is the uh thinnest face that we have um within the family here also we have a 47 G tungsten weight uh that is welded uh within this back piece here um and the the welding is

Interesting because uh we figured out a way where we can weld this into place kind of suspended suspended above the sole so you can see that there’s an air gap there between the tungsten weight and the sole surface there and what that does is actually allows this so to flex

Just a little bit at impact and give a little bit of a contribution in terms of Co so then this back portion with the tungsten suspended there uh is then laser welded to that face neck portion uh to complete the the construction of the head with this construction this uh full hollow body

Construction with the tungsten waiting and the grain flow forg face and neck that we can uh we can achieve all of our design goals right we’re looking for ball speed we’re getting that from the the thinner face on the face neck portion we’re looking for launch particularly in the long irons uh you’re

Getting that from that increased weighting of the 47 gram of tungsten and the hollow body construction is naturally going to have a kind of a deeper center of gravity when you’re looking at the entire set the construction that I just described is the two iron through seven

Iron the eight iron is a very similar construction but because now we’re getting a little bit more Loft on it and now we want to do something a little bit different with the center of gravity the the tungston goes away and on the nine pitch and gap wedge those are actually

1025 mile carbon steel with partial Hollow and that partial Hollow is there to again affect the Mass properties of the head because we’re once you get to those those higher Loft Club heads we actually want a higher center of gravity the flight B the ball down so we this

Set is very has very unique Mass properties going from four uh like in a in a in a normal set going from four to gap wedge we’ve got very low and deep in the 4 through seven iron and eight iron that’s a transition club without the tungsten and a nine pitch gap wedge

Which are partial Hollow to get the center of gravity where we need it for the performance we’re looking for the forging of this head is slightly different than the full uh head forgings like the 241 and the 243 it doesn’t use the air hammer press it actually the

Primary forging for this guy is A600 ton hydraulic press but similar to the other models the uh Precision forging is the same 630 ton hydraulic press but still grain flow forged the factory choyo and Hiroshima the same grain flow um the same incredibly solid feel the set is

Designed as a whole to be like a perfectly ordered Set uh with some very unique Mass properties flow from long iron to scoring iron um and it’s just it’s designed to work really well as a set