Denier is defined as the mass in grams per 9,000 meters
400 Denier = 400 grams per 9000 meters yarn.
Uni BigFly Thread - Filato
Spedizione GRATUITA per ordini superiori a € 79
Designed specifically for big saltwater flies, bass bugs and other tying applications where a very strong, easily-handled thread is necessary. Same material ( polyester ) as UNI 6/0 & 8/0 so it won't dull fly-tying scissors.
4 times stronger than a 6/0 thread and four times bigger too .... Untwists quickly and easily for flat-thread applications.
Breaking strenght: 100 oz (2,83 kg)
80 yds. per spool.