GSP Threads 150D (3/0) - VeevusIts diameter is equivalent to 3/0, but its strength is far higher! The GSP Threads Veevus Microfilaments 150D is simply the strongest tying thread in the world  for its diameter! This thread flattens as you wrap it , effortlessly gripping every tying material. Veevus Gel Spun Polyethylene..