2 Pack Replacement Spool Cap Cover(50006531) for the WORX GT protects your spool line and keeps it in place on your grass trimmer / edger. Each Spool Cap Cover is made from high-impact resistant ABS material to provide strength & durability. The WA6531 snaps into place quickly & easily - no tools are required 6 Pack Grass Trimmer Line (WA0004 ) features a revolutionary and innvoative DNA2 DoubleHelix line that is superior to the standard round line by producing an improved cutting action, which helps to keep grass healthier and greener. The patented polymer blend is specifically designed to last longer when edging against rough surfaces, while the aerodynamics reduce noise and line flutter.