Gauge Design putters have three new Patented features: We have patented a new 6 dimensional sole plate design. This sole plate allows the putter to sit firmly on the ground and aids in proper alignment. Our new hosel design, "3 Dimensional Parallel Hosel Configuration" was extremely difficult to machine. We had done weeks of 3D machining work to perfect this unique design that will eventually be adopted throughout our entire line of putters. The new hosel design is on the GA02, GAA2 and GAA0. The Aluinser™ Patented System is a new blend of insert technology that offers the golfer a new weighting system that increases the heel toe affect and does not compromise ball feel with a face insert. The Aluinser™ gives the putter an elevated center of gravity that improves ball roll. We are firm believers that an insert on a face is a definite compromise when it comes to putting. The soft mushy feel of face inserts is what we do not want, other manufacturers have compromised feel and sound feedback by using face inserts.