Denier is defined as the mass in grams per 9,000 meters. 75 Denier = 75 grams per 9000 meters yarn.
UTC Kevlar G.S.P Thread 75 Denier
The breaking strength of this 75 denier thread is a whooping 4.5 lbs. - 50 yds spools. It’s ideal for all fly-pattern ranging size #24 Midges to #10/0 Billfish flies.