If the nylon line isn't for you then this Stihl poly cut head replaces the string for swinging plastic blades. This head comes with 6 extra replaceable blades.
Fits: FS 38, FS 40, FS 45, FS 50, FSA 60, FSA 86
This head replaces part number 40067102134
Both the newer Green blade pack 400200071020 and older orange blade pack 400200071000 fit this head
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$115.83