Lehigh Mason Line, Twisted, NO 18, 800 ft Length, Nylon, White, Resists: Abrasion, Rot, Mildew and Chemicals, For Net Repair, Fishing and Duck Decoy Line. Lehigh Mason Line, Twisted, NO 18, 800 ft Length, Nylon, White, Resists: Abrasion, Rot, Mildew and Chemicals, For Net Repair, Fishing and Duck Decoy Line.