s-sectional views of the shaft of the golf club in FIG. 8a. [0043]FIGS. 8e to 8 g are side views of the golf club shaft of FIG. 8a taken along section line C-C. [0044]FIGS. 9a and 9 b are a top view and a side view, respectively, of an automobile that contains superelastic components. [0045]FIG. 10 is a side view of a bicycle that contains superelastic components. [0046]FIG. 11 is a side view of a