The standard tying thread used by most fly tyers. It is characterized by a particularly rough surface that makes it suitable for use with any dubbing. It is also a thread with excellent breaking strength in relation to its size, also suitable for making large bodies and can be used on hooks ranging from #6 to #10.
The bonderization treatment used to make it allows, with a minimum of skill, to easily split it in half to make a loop dubbing without doubling it.