UNI-Threads are the favorite fly-tying threads of fly - tiers all over the world. Noted for being exceedingly strong for its diameter.

UNI-Thread is made of continuous polyester filaments, slightly bonded, which ties flat on the hook. 3/0 thread is good for bigger flies. 6/0 thread is good for big and middle sized flies. 8/0 is nice all-around thread for smaller flies.