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Stihl CF3 Pro is built for the parts of the yard that fight back. The .105-inch line on this 180-foot spool uses tri-extrusion construction and a carbon-reinforced core so the string stays sharp and keeps cutting longer. The shaped profile gives multiple cutting edges that slice thick grass and stubborn weeds clean — not rip and shred. That means faster passes, fewer reloads, and less time standing there swapping line. It’s tougher than plain nylon: lasts up to three times longer in heavy use and resists heat and weld-up when you’re running hard. Works in any STIHL nylon trimmer head and most competitor heads, so you don’t need special gear to swap it in. If you run a jobsite, this line saves you time and replacement cost while cutting cleaner, quieter, and straighter than cheap round string.
