Ultra Thread is a strong, flat, smooth, lightly waxed, slow building nylon thread.
UTC 140 is great general purpose thread for trout and other flies in the 6 to 16 size. The breaking strength of this thread is about two pounds. This thread will serve the beginning fly tier well, as it is not too bulky and its strength prevents breaking the thread until proper techniques are learned.
UTC 210 is an excellent for deer hair, steelhead, salmon, saltwater, and other flies in the 1/0 to 12 size. The breaking strength of this thread is about three pounds.
The UTC Ultra Thread 140 & 210 Denier is made in the U.S.A.