Denier is defined as the mass in grams per 9,000 meters. 75 Denier = 75 grams per 9000 meters yarn.
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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.