TaylorMade used 15 grams of high-density Tungsten in the toe-side sole of the 3 through 7 irons to lower and center the CG.

This was to create even more speed and distance by way of an increased moment of inertia (resistance to twisting) on off-center impacts.
Weight savings were also made by using a fluted hosel which means the weight could be redistributed to key areas therefore not compromising the look preferred by better players at address.
We’ve once again got face slots which were first seen in the RSi irons and are are designed to improve consistency of ball speed on off-centre hits.

TaylorMade 2017 M1 irons review – The results/NCG verdict
I hit the new M1 irons alongside the new M2 irons to see which would be my model of choice.
It was really pleasing to see that the performance with the M2 and M1 were very similar.
Granted, the really bad shots with the M2 were a little better than the rubbish ones with the M1 but overall I wouldn’t say there was much in it.
So if it came down to a straight choice it would be the M1 all day for me.
TaylorMade have succeeded in creating an iron that has the performance benefits of the M2 bus looks, sounds and feels much better.
Also, these irons go really far. I’d normally expect to carry a 7-iron 145 yards but with the M1 and M2 I was getting it to carry up to and over 155 yards with a total distance of 163-165.
I did thin a couple which carried a bit further…

Yes I know the lofts are a bit stronger than most 7-irons on the market but the flight does seem to be nice and high.
If you adjust your yardages accordingly, you won’t be flying it over the back of the green.
I’d expect these irons to be popular with players from 5-20 handicaps so TaylorMade have done a great job in creating an iron with such wide appeal.
Details
SRP: Steel 7-piece set – £849, Graphite 7-piece set – £1,049
Stock shafts: True Temper XP95 steel or MRC Kuro Kage Silver graphite. Additional custom shaft options are available.
In store: March 2017
For more information visit the TaylorMade website HERE
[skylab_video id=”51819″]YouTube M1 irons[/skylab_video]