Usage Tips:Compatible with Contour 500 XT Power Trim 500 XT Mini Trim Auto ST/XT/Plus XT Mini Trim Contour . 500/7 00 (pnc 9648596/7) Revolution 2000/2300/2500 and Twist and Edge. Please check the model carefully before purchasing to ensure it is the correct fitting you need Package Content: 4/6/10 Replacement Line Spools for Flymo FLY021 Trimmer Spool Made of ABS and Nylon Line: The trimmer replacement line spool was made of premium raw material, quite sturdy ABS spool, soft nylon rope, strong enough for long service life. Save labor time - Easy to use and install pre-wound - Tool-free installation - Installs and removes from trimmer for easy use - Long lasting to save you time and energy Precautions for use: Strong centrifugal force and rapid cutting during use, it is recommended to wear eye protection and long pants to avoid unnecessary injury. And this wireless weed eater charging is only suitable for tender weeds. It is recommended to use blades to cut weeds.