The strongest thread on the market boasts steel-like strength for its weight. Made of a gel-spun polyethylene, it's supple and ties flat. Great for situations where you need to apply more tying pressure, such as when you're using deer hair. Per 50-yd spool. Colors: White, Yellow, Orange, Brown, Red, Olive, Black, Chartreuse. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Thread.