Pack. This round trimmer line is the perfect replacement line for all gas and electric trimmers. Commercial grade trimmer line that features superior wear, formulated using the highest quality copolymers to provide maximum line life. Outstanding toughness, engineered for ultimate impact resistance. Directional aerodynamics always presents the cutting blade forward. Extra clean cutting, minimizes browning of cut grass tips. Processed to minimize line split and frays. 20-30 Percent more rigidity for diamond like cutting performance. Greater momentum provides higher impact resulting from 10 percent greater line mass. Excellent for both grass and tall weeds, and will provide excellent service on all weed trimmers. Measures 0.09-inch diameter.