A single milled flange line for a cleaner, Tour-preferred look at address, but he also increased by 30% the vibration dampening material connecting the 6061 aircraft grade aluminum face-sole component to the stainless steel putter head for better sound and feel. With a re-engineered four-way balanced sole, refined precision milled flange and improved sonic qualities, the new Fastback with its single bend shaft is a mid-mallet that's as performance-minded as it is aesthetically pleasing. PERIMETER WEIGHTING: Sound, feel and balance have been optimized by moving the heavier stainless steel to the perimeter and incorporating the lighter aluminum face-sole component - including a weight-saving single bend shaft - to increase visual real estate, adding forgiveness, and ultimately, confidence. FOUR-WAY SOLE BALANCING: The putter's stance has been re-engineered to account for the weight of the shaft and grip via subtle re-distribution of sole metal from heel-to-toe and face-to-cavity so the putter sits squarely and aligns perfectly at address.