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: Round trimmer line – the most popular trimmer line shape. Offers effective cutting for a range of applications. More durable and longer lasting than square trimmer line; .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: Rotary 3513 and Stens 380-477; ; ; Oregon Equipment Parts 21-505 Gatorline Round .105 5Lb Spoo