Yonex Aerosensa AS-40 Shuttlecock YONEX AEROSENSA shuttlecocks are the official shuttlecock for the world’s leading international tournaments. The precisely engineered technology in every lightweight YONEX feather shuttlecock is extensively checked and tested to guarantee consistent performance. YONEX Feather Shuttlecocks are precision-manufactured to ensure the correct speed, distance and stability performance. Product Description   Yonex Aerosensa 40 (AS-40) Material: 100% solid cork, goose feathers Color: White Quantity: 1 Dozen (=1 Tube =12 Shuttlecocks) Speed: 3 / 77 / Medium