Yonex YONEX Badminton BG66 Ultimax Team 100 100M Roll String High Repulsion High Control Top Players Control BG66UM1 Used by top players worldwide. 0.65mm thin gauge for high repulsion and high control. Smashes are faster, and the control of receives is improved. Core: High-strength nylon: Multifilament Side: High polymer nylon: Braiding processing Approved by the Japan Badminton Association Length: 100m Thickness: 0.65mm Made in Japan