... diamond series new style badminton racket: Frame: ultra high stiffness carbon fiber Shaft: High modulus carbon fiber Weight: 3U Stringing Lbs: ... ;2.enhance the strength of frames3.relieve strings' high tension to make the athlete more comfortably play;4 ... rackets, badminton rackets, and tennis, shuttlecocks; every kind of high, medium stringing machines, screen wires, strings, grips; and every ...