Worx WA0004 Replacement 10-Foot Grass Trimmer/Edger Spool Line 2-Pack for WG150s, WG151s, WG152, WG155, WG165, WG166, WG160, WG167, WG175 Constructed from a patented copolymer nylon resin and synthetic material Designed to increase edging life by 25% Includes over 100lbs of tensil strength Replacement cutting line for the Worx WG150 and WG151 series trimmers 0.065-Inch cutting line. Patented Copolymer nylon resin + synthetic, Oval aerodynamic .060 twisted with .75 twist per inch 10-Foot long for added longevity Powerful single-line release with helix braid provides added cutting power 2-Pack pre-wound spool for quick line changes