The instructions I got for my spectra kite line said that the line had to be stretched first before it was used. This seems consistent with this type polymer, which tempers after being stretched and sets up with little or no further stretch afterwards. I believe most spectra line has to be drawn like this. I dunno about other line/cord. I've never had to pre-stretch dacron. I think dacron is also harder to cut through than spectra line. I know dacron is definitely more abrasive, it is the most abrasive fishing line I've ever used. Would this make it a good line to snare things with? Hmmm....