A Major Difference The new Flatso Putter Grips feature a distinct pentagonal ?Flatso ? profile: a wide, flat front grip shape with five pronounced edges. Now with Traxion Control and Spyne Technology, the Flatso Series has been refined to offer even better feel and feedback. Golfers will know instantly if one of Flatso ™s three unique sizes can make a major difference in their game. Just ask Jordan Spieth, a Flatso user who has trusted the grip for each of his three major championship victories. No CounterCore weight is included with the grip but additional weights may be purchased separately Technology Traxion Control: An advanced surface texture that improves feedback and tack. It places ?X-shaped ? treads in high sensory areas on the sides and bottom of the grip to enhance feel and comfort. No Taper Technology: Patented technology helps golfers minimize grip pressure with a unique parallel design. The uniform lower hand profile assists golfers in quieting their hands and adding consistency to their stroke. Spyne Technology: A heavily embossed ridge along the underside of the grip that guides golfers to repeatable hand placement, making it easier to square the face at impact and start more putts online. Tech-Port: Allows golfers to counter-balance their putter to their specific needs. Tech-Port accepts all SuperStroke accessories including the CounterCore weight system. Specifications Diameter: 1.38 Weight: 61 grams Core Size: .580 inch