100 Yards Elastic Cord Stretch String Elastic Craft Thread for Jewelry Making (Black, 0.08 Inches)

Does this have a uniform exterior finish or is it fuzzy and ratty?

Does this cord stay tied when you double knot it by hand? I've had trouble with making kids bead jewelry out of other cords that tend to come undone.

How will this handle being in the weather?

is this really 2mm thick?