The more traditional string trimmer heads are the manual-feed ones. With these, you have to load the line and pull out a ...

This brand sports five styles of cutting heads that utilize string on their trimmers: Speed-Feed (400 and 500), Rapid Loader, ...

Feeding out more line can be trickier on some trimmers, which will slow you down. There’s three types of line feed: Bump feed - where the grass trimmer is banged on the ground and feeds out new line.