Veevus GSP (Gel Spun Polyethylene) Thread By far the strongest thread on the planet after Veevus' standard thread Designed with a slight twisted - preventing it from opening up, and thereby making tying with it a breeze Lays completely flat and is the smoothest thread to spin hair with Available in 2 colors: Black & White / 4 sizes: 200 denier, 150 denier, 100 denier and 30 denier Each spool contains 75 meters of thread