3/0 UNI-Thread serves the fly tyer who regularly ties on hooks larger than size #12. It is of the same material as 8/0 and 6/0 UNI-Thread, but with an increased number of filaments. It is available in Twenty one popular colours: Black, Brown, Fluo. Chartreuse, Green, Gray, Iron Gray, Dark Brown, Light Blue, Light Cahill, Light Orange, Olive, Olive Dun, Orange, Pink, Purple, Red, Rusty Brown, Tan, White, Wine, Yellow. Combo packs of twenty (20) spools are also available for the 50 and 100 yds.