This professional-grade mason line is constructed from high-strength virgin nylon yarn that provides a tensile strength of approximately 168 lbs. making it suitable for demanding construction and masonry applications. The braided design features tight, consistent weaving that prevents unraveling and maintains straightness under tension when stretched between guide points. Bright fluorescent coloring ensures high visibility against various backgrounds including brick, stone, and concrete surfaces, reducing eye strain during extended use and improving worksite safety. The material's resistance to moisture, abrasion, and UV degradation allows for reliable performance in diverse weather conditions from rain to direct sunlight. The nylon construction offers minimal stretch characteristics that maintain alignment accuracy for bricklaying, concrete form setting, and foundation marking tasks. The line's diameter balances durability with handling comfort, allowing for smooth deployment from storage reels without excessive stiffness or tangling during application.