okay...here we go again....

[Dryrod]

[font "Comic Sans MS"][#008000]Fly tying thread comes in varying sizes based on breaking strength and size, or denier. The thread size has a direct correlation with the size of the fly being tied. Streamers on size 2 and 4 hooks need larger 3/0, big fly or gel-spun thread, while dry flies on size 18 and 20 hooks need 8/0 or smaller thread to avoid overcrowding the hook. Although thread size is relative to breaking strength, most small threads have high breaking strength. Small threads have various functions; larger sizes are ideal for securing bulky materials to a hook.[/#008000][/font]
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