The SS 50G counter core Weight For + Series has been design to fit counter balanced superstroke putter grips 2.0XL, 3.0XL & Flatso 2.0XL Plus series grips. This weight kit means that you can change the feel of your putter with a 50g weight with this simple tool that uses a proprietary new thread on the putter cap to quickly allow the user to change the putter easily & quickly. Gain the feel you require with this weight kit.