Auto Feed System Replacement: It was designed for WORX string trimmer. With Auto Feed System Replacement Spool eases the tedious work of hand-winding spools. Cuts Fast and Wearable: Premium 10 ft./ 0.065 in wearable line, and includes 12 high-quality spool trimmers for a better replacement and continuous operation Saving Effort: Flexible nylon rope and automatically feed the cutting rope with the centrifugal force for more efficient cutting 12+1 Accessories: Package contained 12 packs 10-foot trimmer lines; 1 pack replacement spool cap cover. Compatible with WORX Models: WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180