In 2016, TaylorMade Golf launched M2 irons which delivered distance and height for the recreational golfer. In 2017, M1 and M2 irons added Face Slots into the equation to produce even more forgiveness. This year, the new M3 and M4 irons introduce RibCOR technology to optimize energy transfer, increase ballspeed, and ultimately produce longer, straighter shots.


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The Science of RibCOR


When the club head of an iron strikes a ball, only a certain percentage of the energy is imparted back into the ball, as reflected by the measured "coefficient of restitution" (COR) of that head. Any flexing of the head that is not directly located at the impact point on the face is lost energy. By strategically stiffening the structure of the iron head, RibCOR technology greatly reduces energy loss, especially on mishits.


RibCOR technology works in conjunction with Face Slots to stiffen the area outside the scorelines while retaining flexibility and COR in the area inside the Face Slots. When these proprietary TaylorMade technologies are implemented simultaneously, the performance benefits are amplified. The outer structure of the iron remains stiff, while the face remains free to flex during impact—enhancing energy transfer that leads to increased ballspeed. 


RibCOR technology also allows for placement of additional mass in the heel and toe areas of the head, resulting in a significantly higher moment of inertia (MOI) than the corresponding 2017 irons. This combination of benefits provides irons with RibCOR technology a substantial increase in overall forgiveness.


M4 Irons: Straight Distance with Incredible Forgiveness


The new M4 irons offer players increased distance, forgiveness, and feel. The new M4 irons push the limit of COR, providing the maximum possible ballspeed off the face. To achieve M4’s crisp sound and feel, TaylorMade’s new RibCOR internal ribbing structure works to stiffen the iron body while imparting maximum energy to the ball during impact. Additionally, a multi-material damping badge works in tandem with the RibCOR technology to efficiently dampen undesirable vibrations during impact, producing major improvements in sound and feel.


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M4 irons (4-7) also utilize Face Slots and Speed Pocket™, as well as a new, redesigned off-center Inverted Cone Technology (which is also found in the M3 irons). Each technology has been individually optimized specifically for M4 to deliver incredible distance and forgiveness. Additional technologies in the M4 include a Fluted Hosel 2.0, an ultra-thin 1mm topline along with the company’s thinnest-ever leading edge.


With forgiveness being a significant focus of M4 irons’ engineering process, TaylorMade went to great lengths to achieve its high-MOI design. Optimized mass distribution (toward the heel and toe) resulted in a high resistance to twisting of the head during an off-center impact, which translates to preserved ballspeeds and improved forgiveness across the face. With high-MOI head designs (24% higher than ’17 M2), M4 achieves faster ballspeeds, giving the iron more distance across the face and offering optimal forgiveness for any player.





M3 Irons: Straight Distance for the Discerning Golfer


M3 irons deliver distance while still retaining accuracy and workability in a more appealing, compact head shape preferred by better players. Housed within the smaller design of the M3 iron, RibCOR technology works to protect ballspeeds, which improves overall accuracy and increases forgiveness across the clubface (specifically on off-center impacts).


Similar to the M4 irons, the M3 irons push the legal limit of COR to maximize the legal ballspeed across the clubface. TaylorMade engineers were able to accomplish this by incorporating new technologies, including RibCOR, which stiffens the iron’s body to impart maximum energy to the ball during impact. Additionally, a multi-material damping badge works in tandem with the RibCOR technology to efficiently dampen undesirable vibrations during impact, providing a clean, crisp sound and feel.




M3 irons (3-7) also incorporate many of the same proven technologies as the M4 irons: Face Slots, Speed Pocket and a redesigned off-center Inverted Cone—all optimized specifically for the M3 to provide players with distance, height, forgiveness, and straightness. Additional technologies in the M3 include a 180° Fluted Hosel, a 360° Undercut, and individually sized tungsten weights to locate head CG for optimal launch and ballspeed.


With M3, TaylorMade also appeals to the eye of the low-to-mid-handicap golfer with a refined, confidence-inspiring shape. Featuring a thinner topline than last year’s M1 and a straighter leading edge for a cleaner address view, M3 delivers powerful, high-MOI performance that boasts shot-shaping ability not typically found in game-improvement irons.


M3 irons are also shaped to enhance effective bounce, which helps maintain turf interaction conditions that are suited for a wide variety of players, including higher handicaps.


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Chris Edwards
Copywriter — TaylorMade Golf

Nice write-up. look forward to trying them out at one of your events this year


I got a new set of the M4s as part of the release date on February 15, 2018. Prior I had a set of M2s and had an issue with the quality of the irons. Instead of replacing my M2s that had issues, Taylormade worked with me to replace my complete set with the M4s. 


It was the best move I have ever made. I love the M4s. I am a bogie golfer, so dont always hit the ball square. LOL. These M4s are very forgiving and the distance is an average of 10 yards longer compared to the M2s. 


I also believe in the complete club makeup and Taylormade worked with me again to upgrade to the Project X shafts and Golf Pride grips. Ended up with a fully custmized set. I do know the Project X shafts made a positive difference from my M2s but trully believe the combination of the two made this one of the best irons I have ever owned. Plus the feel of the M4 iron is awesome.


Kudos Taylormade.


Awaiting my M3 irons now that were fitted to me. 


@MrEddyG  hey same ordered mine a week ago but a had a championship and they are coming tomorrow. I’m 13 years old.