Wilson harmonized m5 mallet putter the harmonized m5 mallet putter features the best parts of the generic harmonized putters as well as a new eye catching vertical seam grip which has been made with a slightly larger diameter for improved feel easy alignment design horizontal lines on the putter head visually support alignment for a more accurate setup vertical seam grip the midsize harmonized putter grip features a vertical seam on the back side to improve feel throughout the str