plus series grips provide the ability to add back weighting to any putter to achieve optimum balance with a proprietary new threaded cap design players can quickly and easily install a 50g back weight to instantly change feel and response plus series grips are available in two diameters in the legacy profile along with a 20 flatso version all three are 1375prime the 50g countercore weight is sold separatelydiameter 120length 1375weight 78gcore 0580