The trimmer replacement spool Suitable for Multiple WORX String Trimmer Models: WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180.Premium 10ft/0.065 string Trimmer Spool Line and Cap easily cuts through grass and weeds.100-pound of tensil strength compared to old lines that only offer 68-pound of strength,Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces,Aerodynamic shape allows less drag for more efficient cuts.Package Included: 12x replacement trimmer line spool for Worx trimmer; 2x replacement cap;The Trimmer replacement spool is compatible with Worx string trimmer and utilizes centrifugal force to feed the trimmer line as it is needed.The auto feed system replacement spool eases the tedious work of hand-winding spools.Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces.