The Danville Flymaster Plus Thread fly-tying thread is a twisted nylon material thats incredibly strong, durable, and abrasion resistant. Flymaster Plus is somewhat larger in diameter and is great for heavy hair work on larger flies. Offered in some more subtle colors that are not available in Flat Waxed Nylon Thread. 210 denier. Length: 100 yds. Colors: Black, Brown, Fluorescent Green, Fluorescent Red, Light Olive, Red, Tan, White. Cancer and Reproductive Harm- www.P65Warnings.ca.gov.