Compatible with string trimmers ART 30-36 LI, ART 30, ART 27, and ART 24 Dual Line Spool Size: Spool line diameter: 1.6mm, spool line length: 6m, spool model: F016800351 Material: ABS spool and durable polyamide nylon thread, flexible and long service life; This material helps reduce drag and enables fast cutting Save Working Time: Easy to use and install with pre-wound spool; Tool-less installation allows quick replacement, pops in and out of trimmer for ease of use; Long-lasting performance saves time and effort Precautions: Strong centrifugal force and fast cutting action during use; Eye protection and long pants are recommended to avoid potential injury; This cordless weed eater spool refill is designed for light to moderate weed grass; For thick or strong weeds, a blade attachment is recommended F016800351 Dual Line String Trimmer Replacement Spools Compatible with line trimmers ART 30-36 LI, ART 30, ART 27, and ART 24 Specifications: Spool model: F016800351 Spool line diameter: 1.6mm Spool line length: 6m Package Included: 4 spools + 1 cap, or 6 spools, or 10 spools