Orvis Thread Size 6/0 Versatility makes this the most popular fly-tying thread on the market. Made in USA.Ideal for wets, drys, nymphs, and small streamers, this is the basic thread for all but the smallest trout patterns and saltwater flies. Made from 100% poly, 6/0 thread grabs and holds materials in place. In white, lt. pink, yellow, brown, tan, dark brown, red, lt. olive, gray, maroon, olive, orange, black, pale yellow.Imported.100 yards per spool.