ECHO Black Diamond delivers optimal cutting efficiency, optimized fuel consumption and noise reduction, all due to its square-twisted design. Black Diamond offers ultra-fast cutting for professionals and homeowners. The twisted, diamond-shaped line offers razor sharp edges and delivers a clean, even cut with superior cutting performance every time. Intended for medium to industrial landscaping use in residential and commercial environments, Black Diamond delivers the flexibility for both, with a wide range of applications. Black Diamond is manufactured with a high grade nylon to provide exceptional durability, while its twisted cross section ensures longer line life, reduced trimmer vibrations and ultimately less engine drag.