Yonex BG66 Ultimax Badminton Strings 10m set (also available in 200m reels). Perfect balance of speed, control and durability in a medium feeling badminton makes Yonex BG66 Ultimax Badminton String the best choice for the world's top players. Yonex's thinnest multifilament string in a 0.65mm thin gauge has a high intensity core with maximum number of strands making it one of the most comfortable badminton strings with super crisp feel as well as great precision and comfort.