The G.S.P (Gel Spun Polyethylene) is by far the strongest thread on the planet. The Veevus G.S.P. thread has been designed with a slight twist preventing it from opening up, and thereby making tying with it a breeze. It lays completely flat and is the smoothest thread to spin hair with. It is currently available in 2 colors Black & White and there is 75 meters per spool (which is 67% more thread than offered by anyone else in the industry)