Denier is defined as the mass in grams per 9,000 meters. 100 Denier = 100 grams per 9000 meters yarn.
UTC Kevlar G.S.P. Thread 100 Denier
This flat prewaxed thread is one of the thoughest materials available. Approximate size is about 2/0 or 100 Denier and Kevlar is perfect for tying larger to mid-size flies. Since this thread is so rugged, we recommend using razor blades for cutting.
50 yds spools.