A method includes accessing a digital image including a plurality of faces including a first face and a second face. The location of the bone conduction element may be repositioned by sliding a slidably-coupled section to which the bone conduction element is attached. The flaky metals are close to one another, or in contact with one another to form a heat transfer path which transfers heat of the surface of the coating layer to the base material. The frame F further has groove portions. This allows the body to be removably securable to the support. The supporting main body is provided with two sunken portions which are adjacent to two corresponding ends thereof respectively.