Compatible with Bosch string trimmer models 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 with long service life; This material helps reduce drag and enables fast cutting Save Working Time: Easy to use and install with pre-wound, tool-less installation; quickly inserts and removes from trimmer for convenience; long-lasting design 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 replacement spool is intended for light-duty use on tender weeds only; for thicker or stronger weeds, a blade attachment is recommended F016800351 Dual Line String Trimmer Replacement Spools Compatible with Bosch line trimmer models 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