Why do weed whackers/weed eaters often use plastic string and not metal wire?

Question

Why do weed whackers/weed eaters often use plastic string and not metal wire?

In: Other

Answer 1

Because the string breaks off in use (even metal wire would do this) and having bits of plastic in your lawn is considered less hazardous than short slivers of metal that would stab into you when you step on them or when they go flying as they break off.