Veevus GSP Fly Tying Thread is an awesome fly tying thread that should be a part of your bass fly tying material for spinning deer hair. If you tie bass bugs or any other flies with spinning deer hair or a pattern where you need the ultimate in strength the Veevus GSP Fly Tying Thread is the best choice. Flies like the Umpqua Pike Fly will be easier to tie with Veevus GSP. Choose the 200 for the largest flies and 100 for smaller flies.