The Yonex BG66 has a 0.65mm thin gauge and the perfect balance of maximum speed, control and durability. This makes it the best choice for the world’s top players. Yonex BG66 Ultimax is one of the top strings on the market. It provides you with an instant improvement in repulsion as well as increased control. The perfect string for the hard hitter or competitive player.Material: High-Intensity MULTIFILAMENTLength: 10/200m (33/656 ft)Gauge: 0.65mmKey Properties: High Repulsion; Medium Feeling200 meterMade in Japan