The STX Sync Series 1 Putter is the flagship of the new Sync Series from STX. The SS1 is a T-shaped mallet similar to the very popular Sync Tour Pro that was used to win the 2002 PGA Championship and will utilize the latest STX insert development known as F.E.E.L. Technology. "F.E.E.L." is short for Friction Enhancing Elastomer Layer and it dramatically increases the coefficient of friction to put a greater amount of topspin on the ball and keep your putts on line.