A.M. Leonard makes their Aero-Glide Trimmer Line using a premium-grade resin. This line measures .105 inches in diameter. It is packaged it in a one-pound donut. This style of trimmer line features multiple cutting edges. This multi-edge design cuts cleanly and quickly. The twisted shape improves the aerodynamics of the line. This improvement reduces noise and decreases vibration, which enhances fuel/battery efficiency. A.M. Leonars makes their trimmer line to last. Their premium-grade resin material increases the life of the line.