It’s construction is a cross between a floss and a thread which means it can also be used for tags, tails, hot-spots, wings and heads. It is easily twisted tight or loose and split to insert whatever dubbing-type material you might want to bind down.
Oh and you Chironomid and Buzzer guys, try it out as the body of the fly, you'll love it!
Small (49m per spool)
Medium (36m per spool)
Large (30m per spool)
Check out this Veevus Video for a closer look.