.080 inch line
This is fine for lighter grass and smaller battery trimmers. I would not choose it as the main line for thick commercial trimming unless the tool is clearly built around lighter work.
.095 inch line
This is the practical sweet spot for many commercial straight-shaft trimmers. It handles regular weeds and fence lines without overloading most pro gas models.
- Good default for weekly maintenance and heavier yard work.
- Works well on many ECHO, Husqvarna, Shindaiwa, and battery pro-style trimmers.
- Still check the manual before forcing heavier line into a head.
.105 inch and heavier line
Heavier line is useful in rougher growth, but only when the trimmer has enough torque and the head supports it. On weaker battery tools, heavy line can hurt runtime and cutting speed.
Round, twisted, square, or serrated?
Round line is easy to feed and forgiving. Twisted line can be quieter. Square and serrated lines bite harder but may wear faster and load the tool more. For most buyers, size and feed reliability matter more than exotic shape.
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