Guerin Rife IMO Putter This makes swinging on plane automatic. No pulls. No pushes. Just dead straight.nbsp A new weighting innovation This makes swinging on plane automatic. pulls. No pushes. Just dead straight. All aluminum putter head with 85% of the total mass concentrated in the middle 40% from a front to rear direction. The sides are hollowed out underneath and only represent the remaining 15% of the heads mass. The USGA requires that a putter must be longer from a heel toe direction than from front to back. The IMO is right under this limitation, measuring 4.75 wide and 4.60 deep. By concentrating mass in the center of the putter, a golfer will naturally swing on plane. Also this center mass acts as a ramrod that continues thru impact which helps cure the 1 fault in puttingdeceleration. Introducing the IMO. A new weighting innovation from Rife Putters. Weve positioned 85% of the putter heads mass directly inline behind the ball giving the IMO very high MOI and incredible stability. This makes swinging on plane automatic. No pulls. No pushes. Just dead straight. AND READY TO SHIP. the IMO. A new weighting innovation This makes swinging on plane automatic. pulls. No pushes. Just dead straight. Features Material injection mold aluminum. Face Plate 6061 milled aluminum with RollGrooves Head Weight 360 grams Swing Weight 35 F3 Feel Wt. C9 Shafting face balanced mid heel double bend Lie Angle 70 degrees Offset one half shaft Grip Rife custom Shaft True Temper w flutes MOI 4,900