This thread thickness is the same as Danville 210 Flat Waxed Nylon except it’s twisted rather than lying flat on the hook. They both are capable of high tension making them ideal for tying fresh and saltwater flies. 

I combine shipping costs but eBay no longer processes it. If multiple shipping cost appears at checkout I will refund the extra cost. If you're not comfortable checking out you can request an invoice and I'll prepare one for you. This process will take longer to complete the transaction.

I sold my fly shop and have lots of fly tying material and tools taking up needed room in my house. I'm committed to sell even if I take a loss. If you find these at a lower price, including shipping, I'll beat it.

WHY DIFFERENT COLORS?  I usually tie different colors to identify specific flies, such as red heads for heavily weighted, orange heads for medium weights and yellow for shallow water nymphs. I also like dry flies with different color heads. Another reason is to match colors close to the body material when using floss, silk, or any other material that under-color bleeds through when wet.