I bought pink string from YYExpert and just as I remember its kind of rough. 
It’s not bad, but I like my string a bit more on the soft side.
Maybe the blue string is cotton.
The purple string is also shorter and really rough
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Sometimes I wonder why this site still sells cotton string. Andre Boulay doesn’t recommend it, and I’ve read the comments of a few other people saying they don’t recommend it either. Maybe cotton string is still sold to remind us of where yo-yoing started.
It’s for looping. people are still big loopers…
You should see my looping…
I use YYS string and my own stuff.
…I like cotton string…
Because Andre isn’t the yoyo community. I’m sure that Andre doesn’t like quite a few yoyo’s on the site, but other people do so he sells them
While most of us wouldn’t recommend cotton yoyo string, there isn’t anything wrong with using it if you like it.
yes fluttershy