For gas trimmers:

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

Select curved or straight shaft: Most curved shaft trimmers Craftsman, Echo, Poulan, Stihl or Weed Eater curved shaft Most straight shaft trimmers Homelite, Ryobi or Toro straight shaft

For electric trimmers:

Select trimmer brand: Black & Decker Weed Eater