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 your model carefully before purchasing to ensure compatibility. Package Content: Replacement Line Spools for Flymo FLY021 Trimmer Spool. Made of ABS and Nylon Line: The trimmer replacement line spool is constructed from high-quality raw materials, featuring a durable ABS spool and flexible nylon line, designed for long-lasting performance. Save time and effort – Easy to use and install with pre-wound line. Tool-free installation allows quick attachment and removal from the trimmer for convenient use. Durable design provides extended service life. Precautions for use: Due to strong centrifugal force and fast rotation during operation, it is recommended to wear eye protection and long pants to avoid potential injury. This trimmer line is intended for use on light, thin weeds. For thicker vegetation, the use of blades is recommended.