The number one goal in putting is to “hit your lines.” That means maintaining a square face angle to the target line before and after impact.
The Gravity Grip has an ultra-light EVA foam body that only weighs 35 grams and a 70 gram 10” steel rod directly under the shaft. This downward gravitational pull of the steel rod tells your hands the position of the putter face. Tying the hands to the putter face promotes keeping the putter’s face angle square thru the entire hitting area. This virtually eliminates face rotation at impact.