For gas trimmers:

Select Trimmer Head:
Push-N-Load 4 Line Push-N-Load 3 Blade Easy Wind Bump & Go (straight shaft only) Fast-Loader

Trimmer Brand: Homelite Ryobi Troybilt Troybilt (Red) Troybilt (Yellow) Weed Eater

Shaft Type: Straight Curved

For electric trimmers:

Select trimmer brand: Black & Decker Weed Eater