About this item Suitable For Multiple Worx String Trimmer Models: WG122, WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG160.3, WG160.4, WG162, WG163, WG165, WG166, WG166.1, WG167, WG170, WG170.1, WG170.2, WG170.3, WG175, WG175.1, WG180 Efficient Cutting: 0.065-Inch durable polyamide nylon thread, flexible and long service life. Use centrifugal force and aerodynamics to reduce drag easily cuts through grass and weeds High Quality: Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces. Automatic feeding system to change spools eliminates the time-consuming task of manually winding the line. Makes mowing the lawn easier and more convenient Abrasion Resistant: The trimmer line is made of improved nylon polyamide material with a tensile strength of over 100 lb, which is 30% more durable than other brands and lasts longer More Durable: The spools are made of the latest materials to withstand the high speeds of the weed wacker, resulting in higher durability