The new Yonex Aerosonic Badminton String is Yonex’s thinnest string with a diameter of 0.61mm gauge. Razor-sharp swing with intense, exhilirating sound – The Aerosonic string features Yonex’s “Compact Fitted” construction where the string is densely packed with resin between the core and outer threads. With a 0.61mm gauge, the string provides swift swing along with a resounding and exhilarating sound.