Denier is defined as the mass in grams per 9,000 meters
210 Denier = 210 grams per 9000 meters yarn.
Danville's Prewaxed Thread 70 Denier
FREE Delivery on orders € 100 or more
The industrial standard.
6/0 Flymaster is a fine flat nylon filament thread with a heavy wax. Used for everything except streamers.