QualityParts From Oregon That you can depend on. Impact resistant – Gatorline is made from a Nylon co-polymer that is fortified with additives so it lasts longer and breaks less: Square trimmer line – Slices through vegetation with a clean, even pass; .105" diameter trimmer line is a good size for cutting heavier weeds in your lawn or performing light commercial work; Replaces many OEM parts, including, but not limited to, the following: Rotary 12141 and 12190; ; ; Oregon Equipment Parts 21-405 Gatorline Square .105 1Lb Don