by: UNI Products

Extremely strong, lies flat without the slickness of Kevlar. While it’s the heaviest of conventional (i.e., not GSP or kevlar) thread at 400 denier, it is also the strongest with a tested breaki... More>>

by: UNI Products

This is the lightest thread we’ve seen. It measures just 20 denier, which would be about 19/0 or 20/0. Perfect for your smallest flies. Choose from black or white. 200 yd. spools. More>>

by: UNI Products

A very fine spun clear mono thread that will blend in with any color combination. Available in medium and fine, 100 and 200 yd. per spool, respectively. More>>

by: UNI Products

A very strong flat nylon fly tying thread for tying all types and sizes of flies. It can be split easily to make dubbing loops. Available in two sizes, 70 denier (200 yds) and 210 denier (100 yds), in... More>>

by: UNI Products

The sheen on this fly tying 40 denier filament will reflect and blend with various colors of materials. A strong thread for small flies. 200 yd. spools. More>>

by: Wapsi

Ultra GSP is stronger for its weight than steel and the best value GSP anywhere. Choose from 6 colors and 3 sizes: 50 denier, about the diameter of 12/0 thread and with a breaking strength of 44 oz., ... More>>