Ultra Thread 70 Denier is a great thread for tying flies sizes 14-32. It has a breaking strength of approximately one pound. It works great on midges, nymphs, and dries alike. UTC 70 lays flat, so you can create a flat body, or you can spin it to create a tightly wound rib. Hands down the best thread on the market for your general fly tying needs. Comes in a full complement of fish-catching colors. Comes on a 100 yard spool.