Hey golf world,  I know OEM’S been using tungsten in clubs for a while now,but in particular golf irons many companies put tungsten in the toe , some in the toe and heel or toe and hosel, i know recently Taylormade made put tungsten in Tiger’s irons in the center behind the sweet spot , Also KZG golf has a club that has tungsten in the heel, center and toe what effect does that have on feel etc and does it matter where you put it at ?