Machine milled 6061 Aluminum combined with strategically placed tungsten weighting on the sole and backbar provide unparalleled stability for consistent rolls across the face. With an MOI of 6,000, Spider S is the most stable putter in our lineup. Swing weight will be optimized for precise performance using a heavy tungsten backbar. Played by the world’s best, Pure Roll inserts produce better sound and feel while 45° grooves increase topspin to help the ball start and stay on its intended line.