A double-threaded tying thread, great when you need to put dubbing or hackle into a loop. When tension is applied, this thread works just like any regular thread. Release the tension and it splits in two, making it really easy to put dubbing or hackle in between. Then just spin it up and wind it on, simple as that.
Black 02, Brown 31, Green 20, Grey 15, Hot Orange 23, Olive 08, Orange 22, Purple 29, Red 25, White 01