10 Sets of Yonex BG66 Ultimax SP String 5 sets gray, 5 sets black, for a total of 10 sets. Yonex BG66 Ultimax SP String YONEX BG66 Ultimax SP String YONEX BG66UM Badminton String BG66 Ultimax UM SP Badminton String YONEX Badminton String If you have a preferred combination, please let me know. Individual sales are not possible. Core: High-strength nylon, multi-filament. Outer: High polymer nylon, braided. Length: 10m Thickness: 0.65mm Made in Japan. This product is the SP series, please do not confuse it with the JP series. The SP series is distributed in Southeast Asia. Returns are not accepted. Please do not purchase if you are sensitive to this. Lee Chong Wei Lin Dan Kento Momota Kento Momota Viktor Axelsen Kevin Sanjaya Sukamuljo Marcus Fernaldi Gideon Mohammad Ahsan Hendra Setiawan YONEX Badminton String Guts (String) String String Badminton Yonex String Nanoray Nanospeed Voltric Li Ning Victor Yonex Apacs Maxx