Troutsmen Kevlar Fly Tying Thread - Kevlar thread is the perfect choice for tying bass bugs, saltwater, steelhead, salmon, and streamer patterns. Many tiers also use it for "spinning" deer and elk hair for hair bugs. This thread is very strong and you can cut yourself with it if you try to break it by hand. This super strong thread can handle heavy tension applications. Kevlar filament 50 yard spool Exceptionally strong Great for spinning hair