WORX WA0010 Replacement 10-Foot Grass Trimmer/Edger Spool Line, 6-Pack - See Product Description For Compatible Models 6 pack of 10-foot each helix design copolymer nylon resin and synthetic trimmer/edger linePliable and flexible allowing for the line to stretch and cushion on impact with hard surfacesAerodynamic shape allows less drag for more efficient cuts100-pound of tensil strength compared to old lines that only offer 68-pound of strengthSee product description below for updated compatibility with all WORX lawn and garden products WORX 6 pack timmer/edger line is made from a patented copolymer nylon resin and synthetic material designed with an oval aerodynamic shape known as DNA2 DoubleHelix Line. This patented design increases edging life up to 25-percent compared to normal use conditions. This resin line is softer, allowing for the line to stretch and cushion on impact with hard surfaces. It has over 100 lbs of tensil strength compared to old lines that only offer 68 lbs of strength. DNA2 trimmer line is durable and flexible for longer life. This replacement line is compatible with the following WORX trimmer and edger models: WG150, WG151, WG151.5, WG152, WG153, WG154, WG155, WG155.5, WG156, WG157, WG160, WG160.1, WG160.2, WG163, WG165, WG175, WG180