Eventronic 20 Pack Wa0010 Trimmer String Compatible With, 16 Line Spools + 4 Cap Compatible with Worx Weed Eater: WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180. Abrasion Resistant: The WA0010 trimmer spool is constructed with an upgraded nylon polyamide material that has a tensile strength of over 100 lbs and is 30% more durable than other brands for longer life. Efficient Cutting: The Trimmer line spool for worx weed eater, adopt elliptical aerodynamic shape reduces drag, pliable and flexible, allowing for the line to stretch and cushion on impact with hard surfaces, and increasing cutting efficiency by 50%, making each spool to cut more weeds. Automatic Feed Spool: The weed eater spool for worx weed wacker, automatically feeds the trimmer by centrifugal force, reducing the tediousness of manually sorting out the replacement trimmer line spool during work. Professional Seller: As a professional brand, we have an excellent after-sales service team and and product quality control. Package contains 16 pack WA0010 replacement spools 0.065" 10ft/pack, 4 pack WA6531 spool cap covers.