Fixed axle string

What do you guys use for fixed axle yoyo string specifically? I thought I had some 100% cotton string, but my string nest seems to have consumed it and I can’t find it. Whatever it was, though, I didn’t really like it. It seemed way too thin.

Slick 8 or slick 6 works well.
(50/50 cotton/poly)

100% cotton type 10

^^^What he said.