Compatible with Contour 500 XT, Power Trim 500 XT, Mini Trim Auto ST/XT/Plus XT, Mini Trim Contour .500/.700 (PNC 9648596/7), Revolution 2000/2300/2500, Twist, and Edge. Please check the model carefully before purchasing to ensure correct fit. Package Includes: 4/6/10 Replacement Line Spools for Flymo FLY021 Trimmer ABS Spool & Nylon Line: The replacement line spool is made from high-quality materials. The ABS spool is durable and the soft nylon line provides reliable performance for extended use. Precautions for use: Due to strong centrifugal force and rapid cutting action during operation, it is recommended to wear eye protection and long pants to avoid potential injury. This trimmer is designed for light-duty use on tender weeds. For thicker vegetation, blade cutting tools are recommended.