The Adidas Uberschall F66 solar yellow 0.66 badminton racquet string has a length of 10 m and made of nylon and polyamide and includes 1 set of string. The Sonic skin has a special coating that amplifies the speed for a repulsive hitting. The spherical quad jacket helps in retaining the durability and hardness of the string. The compact multi-filament core further helps to improve performance.