... Shape:round, trigon, square,star,hexagon,heptagon,twist,saw blade Color: Any color Nylon Trimmer Line 1. Diameter ... .3. Shape: round, trigon, square,star,hexagon,heptagon,twist,saw blade ,etc4. Material: Nylon 65. Grade: Economic Grade, Commercial ... weld-resistant performance4. Directional aerodynamics always presents the cutting blade forward5. Premium copolymer formulation for commercial toughness 6. ...