Compatible with Contour 500 XT Trim 500 XT Mini Trim Auto ST/XT/Plus XT Mini Trim Contour XT Speedi-Trim Contour 500/700 Mini Trim Auto/Auto and Multi Trim 250D/250DX/300D/300DXTrim (pnc 9648641) . 500/7 00 (pnc 9648596/7) Revolution 2000/2300/2500 and Twist and Edge. Please check the model carefully before purchasing to make sure this is the correct fitting you need Package Contents: 4/6/10 Clipper Replacement Line Spools FLY021 ABS Spool Nylon Line: The trimmer replacement line spool was made of premium raw material, ABS spool strong enough, soft nylon rope, strong enough to long life. Save labor time - Easy to use and install pre-rolled - Tool-free installation - Installs and removes from trimmer for easy use - Long lasting for save you time and effort Precautions for use: strong centrifugal force and fast cutting when using, it is recommended to wear eye protection and long pants to avoid unnecessary injuries. And this cordless weed eater charging is only suitable for soft weeds. It is recommended to use blades to cut weeds.