Bruce Lee popularized the use of nunchakus in martial arts films during the 1970s, but for some reason, this weapon never shows up in wuxia fiction. We see all kinds of weapons in wuxia fiction...ranging from your common swords and spears to ironclad folding fans, large scissors, and ink pen brushes. I can't remember a single instance of a wuxia character using the nunchakus, however.
This might be because the nunchaku is more of a Japanese martial arts weapon than a Chinese one. Even so, I believe that Shaolin has a three-stick variation of the nunchakus as part of its weapons set.
So why no nunchakus in wuxia fiction?