Slotline SL-581 Hi-Moment Offset Golf Putter (33-Inch, Right Hand, Steel) One piece forged 6061 aircraft grade Aluminum body, CNC milled for 1.5 hours to final shape Tri-milled face reduces ball contact surface area providing true loft and flat face, getting the ball rolling faster to keep your putts on line Tungsten weighting to bring head to final weight and significantly increases MOI, increasing the sweet spot and improving accuracy Slot and Line alignment system insures proper alignment at address 191g of proprietary Tungsten blend in the Heel and Toe