Nanospeed 9k X vs S

[Deathsticks]

What the diff between NS9k extra stiff and stiff?
I think extra stiff generates more power right?

[phandrew]

This topic has being discussed before so many times. Search first

[drifit]

same title, same question.
for further discussions, please go here (http://www.badmintoncentral.com/forums/showthread.php?t=32754).
thanks.