F3519 UTC 140 Denier Ultra Thread
This nylon thread is engineered for fly tying. It is lightly waxed and lays very flat for low build-up, creating smaller bodies and small heads. Spool caps are slotted to secure the thread end, and color-coded for size. Comes in 4 sizes for tying dry flies to large saltwater baitfish. 140 Denier. 100 yard spools.