Spider GTX Putter TECHNOLOGY EXPANDING THE MODERN SHAPE OF STABILITY Spider GTX sets the standard for performance and construction. The GTX shape resembles the past Spider shapes with True Path and a new extreme back weighting for forgiveness. LIGHTWEIGHT ALUMINUM CAP Made from lightweight 6061 Aluminum, the 194 gram top allows more weight to transfer to the outside of the frame. BACK WEIGHT STABILITY BAR The back weight ring is made of heavy stainless steel - 154 grams, that creates a deeper CG