Compatiable with Bosh string trimmerART 30-36 LI, ART 30, ART 27 and ART 24 Dual Line Spool Size: Spool line diameter: 1.6mm, spool line length: 6m, spool mode:F016800351 Material: ABS spool and durable polyamide nylon thread, flexible and long service life; These kind of material can reduce drag and achieve fast cutting Save Working Time: easy to use and install pre-wound Tool-less installment, pops in and out of trimmer for ease of use,long lasting saves you time and energy Precautions: Strong centrifugal force and cutting fast during using, recommend to wear eye protection and long pants to avoid unnecessary injury. And this cordless weed eater parts refill is only suitable for tender weed grass. Strong weeds will been recommended to use blades to trim F016800351 Dual Line String Trimmer Replacement Spools Compatiable with Bosh line trimmerART 30-36 LI, ART 30, ART 27 and ART 24 Specification: Spool mode:F016800351 Spool line diameter: 1.6mm Spool line length: 6m PACKAGE INCLUDED: 4 spools + 1 cap or 6 spools or 10 spools