Oregon 22-955 Gatorline Heavy-Duty Professional Magnum Line.

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 .155" diameter trimmer line is ideal for professionals cutting tough vegetation and underbrush Fits several string trimmer models including, but not limited to Remington RM1159