Yardworks 250’ Round Trimmer Line is tested for durability and abrasion to ensure a superior cutting performance over the course of the trimmer line’s life. Yardworks trimmer line is tested for a multitude of strengths and weaknesses, and round-shaped line specifically demonstrates a higher durability than other shapes. The line provides premium flexibility first, and delivers superior edging performance against the likes of wood, concrete, and metal surfaces. The line can be installed in almost any compatible grass trimmer, so long as it accepts a trimmer line of 0.065” (1.6 mm) diameter.