3/0 Nylon Thread: A good all around thread for flies ranging from #14 up to #8. 3/0 is great for "Humpy " bodies or building tapered bodies on nymphs.

6/0 Thread: Probably the most used size thread. 6/0 is really a 70 Denier. It's main use is for small flies #22G #14. It lays flat and is extremely strong. Two or three turns are plenty for fixing materials. 100 yard spool