Usage Tips:1. What you can get: 3 x String Trimmer Replacement Spool, 1 x cover, enough quantity for using or replacement, working as practical tools. 2. Compatible with for model: F016800569 / F016800385 spool line, which is compatible with ART 23SL and ART 26SL, please do check the model carefully before purchasing to make sure it's the right fitting you need. 3. Work more efficiently: these replacement lines are easy to install and flexible to use, which can use centrifugal force and aerodynamics to ease the tedious work of hand-winding spools, making you work more efficiently. 4. Warm tip: strong centrifugal force and cutting fast during using, please wear eye protection and long pants to avoid unnecessary injury. 5. Reliable material: High-quality ABS spool & durable nylon thread, flexible and long service life. Material:ABS, nylon colour:black Package Contents: 3 * Spool line 1 * Spool cover Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.