Product Details SemperFli Floss is a thin, 400-denier fly-tying material, distinct from other fly-tying flosses on the market, which are typically heavy and thick. The thinner fly-tying floss is versatile, as you can use it as the body for flies of many sizes. Single-strand SemperFli fly-tying floss is excellent for smaller trout flies and, when doubled over, allows the creation of salmon patterns, including clas Read More SemperFli Floss is a thin, 400-denier fly-tying material, distinct from other fly-tying flosses on the market, which are typically heavy and thick. The thinner fly-tying floss is versatile, as you can use it as the body for flies of many sizes. Single-strand SemperFli fly-tying floss is excellent for smaller trout flies and, when doubled over, allows the creation of salmon patterns, including classic salmon flies. Whether you’re tying steelhead and salmon flies or other floss-type flies, SemperFli Floss comes in a range of fluoro and natural tones to match your every tying need. Thin fly tying floss for smaller trout flies Double over for salmon patterns Thickness 400D Material Length: 25m / 27.3 yards (approx ) per spool Prop 65 Warning SEE LESS