Ping Specify Zing Putter. Challenging convention has been a tradition at PING since Karsten Solheim pioneered heel-toe balance in 1959. The Specify Series continues that heritage as it offers golfers a putter that is custom-fit for look, feel and weight. The face and back of the specify putters is joined by two stainless steel, cadmium-plated screws that seat into the back. The back is made from a polymer combined with a heavy tungsten powder. A thin layer of very-high-bond adhesive permanently bonds the face and back, enhancing feel. The Specify Series introduced Optigraphic Effect, the visual contrast of a stainless steel top line and dark flange. The colour contrast increases the ability to align the putter to the target, which translates to optical comfort and confidence over the ball.