VEEVUS GSP THREAD Fly Tying Gel Spun Polyethylene Black White 30 50 100 150 200 | eBay
VEEVUS GSP THREAD -- Fly Tying 30 50 100 150 200 denier - single spools or sets | eBay
Veevus G.S.P GSP Thread, white
Veniard UTC GSP Thread - Southside Angling
FF Nano GSP Thread
New Age Tying Thread | Global FlyFisher | GSP or Gel Spun Polyethylene fly tying thread was fairly unknown when Chris Helm wrote this article. His observations still stand.