Worx replacement line is available in at least two diameters: 0.08 inch (helix-style) and a thinner 0.065 inch line, depending on the spool type.
Worx trimmer lines are typically made from copolymer nylon resin (a patented co‑polymer nylon); some listings also describe them simply as nylon or polyamide.
Many Worx replacement spools come pre‑wound for quick replacement. Installation is typically tool‑free: you pop the spool or cap into the trimmer and it snaps or locks securely into place for compatible models.
An oval/aerodynamic profile reduces drag for more efficient cutting and cushions impacts for cleaner cuts. Product descriptions say this shape can extend edging life by about 25% under normal use.
Both dual‑line (double‑helix) and single‑feed spool options are offered.