Black Vortex Trimmer Line .095 is a patented design that provides less drag, longer wear, needs less power, up to 50% noise reduction, more impact power and decreased vibration. USA made. Twisted line provides an edge for cutting, Large 1140 feet spool, faster cut, non-staining. Made by Rotary Copperhead for professional commercial landscapers. Twisted like a rope. Outperforms round trimmer line and square trimmer line.