Abstract: A golf club shaft is designed to be strong, light-weighted and flexible and to fit individual custom needs. The shaft is made of both graphite and steel. The inner layer of the golf club shaft could be steel or graphite, outer layer of the golf club shaft also could be steel or graphite, any portion of the shaft could be made of steel only or graphite only, and/or the ratio to the graphite and steel could vary depending on the need of the golfers. Steel layer could be made of coiled steel wire springs.

Abstract: A golf club head with diaphragm which divides the cavity of the golf club head and designed to increase the rebounding force of the golf club head face when it returns to its original shape after being deformed so that golfers can hit the ball farther and accurately. The diaphragm can be just one or indefinite numbers, the shape of diaphragms can be flat, concave, convex, bell-shaped or irregular, the diaphragms can have one or indefinite number of hole(s) in it and/or various gases, compound gases or liquids can be put in the cavity of the golf club head or space between the inner wall of the golf club head face and the diaphragm.