Product description Size:6 pack/8 pack 1. 6 /8 pack of each helix design copolymer nylon resin and synthetic trimmer/edger line. 2. Pliable and flexible allowing for the line to stretch and cushion on impact with hard surfaces. Aerodynamics reduce noise and line flutter. 3. Aerodynamic shape allows less drag for more efficient cuts. 4.This spool is an ideal replacement for the original spool of WORX lawn mower, it is a satisfactory replacement spool. 5.Compatibility with WORX lawn and garden products. These spools can be used in the following Worx trimmer/edger models:WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5,WG156,WG157,WG160,WG160.1,WG160.2,WG160and more. Packageincluded: 6 /8 replacement string spool + 2 replacement spool cap