... silk nylon, by multiple silk 4.0.68mm Flexpro brand badminton string FB-85 Typebadminton string FB-85Material:Top grade nylonDiameter0 ... of types of high, medium and low-grade tennis rackets, badminton rackets, and tennis, shuttlecocks; every kind of high, medium ... quality, the products have won the awards of tennis and badminton association and appointed as special products used by BOBBY ERTANTO ...