Compatible with multiple WROX string trimmer models: WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180. 110 LBS tensile strength – 0.065 in. diameter, 10 ft. length trimmer spool provides durable performance. Our premium weed eater string is stronger than standard alternatives. Its flexible design allows it to absorb impact, delivering more efficient cutting. Aerodynamic design – The unique shape reduces drag for smoother operation and cleaner cuts, similar to sharp scissors, making it ideal for lawn maintenance. Made from high-quality materials – PA6 (nylon) + 10% GF (glass fiber). The addition of glass fiber enhances stiffness, wear resistance, and heat resistance, extending the life of the spools and caps compared to standard ABS plastic components. Includes 8 replacement trimmer spools and 2 spool caps.