Yonex Badminton Strings Aerosonic 0.61mm / 10m White 2015 New (Bgaswf) repulsion power /Exhilarating sound penetrate Gauge : 0.61mm Length : 10m / white Structure: multifilament (compact-filled structure) / Material core yarn: high-strength nylon / Side yarn: High polymer nylon (blading processing) Made in Japan. Yonex Japan product. Yonex hologram sticker.