This remarkably stiff nylon material helps turn over large wind resistant flies better than limp monofilaments, making it a perfect choice for constructing both freshwater and saltwater leader butts. Popularly used as a tippet material too when targeting sharp toothed game fish because of its superior abrasion resistance, and a favorite among fly tiers for constructing weed guards as well, we proudly offer Mason's Hard Type Nylon in a variety of popular tensile strengths. Sold 25 yards per spool.