The m8 represents a hybrid design, offering a shape that will appeal to golfers seeking a deeper blade or a small mallet. Alignment benefits of RifleScope Technology (RST). Mild toe hand for m8. 100% milled stainless steel, with milled aluminum back cavity insert behind the face for enhanced feel and enlarged sweet spot. The m8 is the first mSeries putters to also come standard with a softer milled aluminum face insert. Platinum finish.