2017 version golf irons use grooves in the club face have been reduced in this version from eight to six the six new grooves are larger and deeper than the old version and ensure greater ball control the 2017 version with six grooves generates longer carries from those heel toe miss hits with dynamic results on your good shots overall consistency improves m2 irons 2017 version has the advantage of geoacoustic technology geoacoustics are engineered geometry and sound combinations geo geo