Abstract: An improved golf club with controllable dynamic characteristics is provided with a weighting chamber of controllable weight rigidly secured within an elongated cavity defined through the head of the golf club. The chamber is dynamically weighted by providing a volume of liquid-like material such as mercury within it and has an elongated cavity defined through the cross-section of the club head. The cavity consists of a pair of interconnected cylindrical sections and is provided with a threaded set screw located in the rearward cylindrical section for varying the internal volume of the chamber so as to provide variation in its volume as well as the available displacement area for the material contained in it. The weighting chamber, when filled with the appropriate volume of material, functions to increase the head weight by a predetermined amount.