1. What you can : 3 x String Trimmer Replacement Spool, 1 x cover, enough for using or replacement, working as practical tools. 2. Compatible with for model: F016800569 / F016800385 spool , which is compatible with ART 23SL and ART 26SL, please do check the model carefully purchasing to make 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 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. material: High- ABS spool & durable nylon thread, flexible and long service life. Material:ABS, nylon colour:black Package Contents: 3 * Spool 1 * Spool cover Only the above package content, other are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.