Sticky 2.3 Grip Series( COLOR: Red/Black, CORE SIZE:.600 Inches ) Iomic grips are made using high-pressure injection molding to achieve its superb quality. Using this method, they are able to achieve a truly consistent grip. The weight on each grip has a differential of plus minus 2 grams. The methods used to produce conventional rubber grips have a 5 to 8 gram margin of error. Iomic grips release a negative ion that increases blood flow in the hands, which in turn, promotes better feel and feedback in the hands during the swing. 	 2 Softest Grip on the market Iomic Sticky 2.3 Iomic grips are the only grips that are UV protective for more durability