QualityParts From Oregon That you can depend on. High cutting efficiency – Magnum Gatorline allows you to get cleaner, straighter cuts with less effort than traditional trimmer line: Durable – High-strength inner core resists breakage which means that the line lasts longer and you spend less time winding spools; Square trimmer line – Slices through vegetation with a clean, even pass; .170" diameter trimmer line is ideal for professionals cutting tough brush.; Check your user manual for maximum diameter fit-up; Made by Oregon, one of the most trusted brands for trimmer line; Oregon Equipment Parts 22-470 Gatorline Magnum Square .170