Yonex New Official F-80

The first class certification passes the ball: A shuttlecock that is required to be used in the tournaments held by the Japan Badminton Association. 

Waterfowl Shuttlecock/Suitable Classification by Temperature

Display Number---Suitable and Temperature Range

2---27 ~ 33 ℃

3---22 ~ 28 ℃

4---17 ~ 23 ℃

5---12 ~ 18 ℃