A microcellular polyurethane obtainable by reacting a polyisocyanate, a polyester formed from a dimer fatty acid andor dimer fatty diol, and a chain extender. The valve body of the closing valve projects into the interior of the smooth-walled metal pipe and is flush with the outer surface area of the smooth-walled metal pipe. The printing plate is formed by providing a liquid photopolymer on the surface of the support assembly and irradiating the polymer with a source of actinic to form the relief image. An outside rear neck portion of the dual step insert is used as an adhesive surface to adhesively couple the rear neck portion inside the front end of the extension shaft. The face may be selectively textured to enhance certain shots that the golfer may perform.