Hi my name is Duncan Chau, RSL International CEO. Last time we talked about how the circumference affects the speed of a shuttlecock, but what you didn’t know is that when we start making a shuttlecock the circumference at the beginning is much bigger than the final circumference. During many stages of manufacturing process we slowly reduce the circumference to what you see today! Why? Let me show you.
![](https://i.ytimg.com/vi/xh7nBhp0iA0/maxresdefault.jpg)