Superior Feed Design: The 30ft replacement line is factory wound to ensure a smooth and superior feed during use, enhancing your trimming experience. Durable Construction: With a diameter of 0.065 inches, this wearable line is engineered for fast cutting and designed for a longer lifespan, making it a reliable choice for your trimming needs. Compatibility: This spool is compatible with original Black and Decker spool models AF-100, AF-100-3ZP, and AF-100-BKP, as well as a variety of Black and Decker trimmer models including GH400, GH500, GH600, and more, ensuring versatility in your gardening tools. Professional CNC Winding: Crafted with precision using advanced CNC machine cutting and winding technology, this spool allows for an automatic line change, eliminating the hassle and potential damage associated with manual winding. High-Quality Materials: Made from premium ABS for the spool and durable polyamide nylon for the thread, this product ensures flexibility and an extended service life. Its aerodynamic shape minimizes drag, leading to more efficient cuts. Safety Precautions: For your safety, it is advised to wear eye protection and long pants when using this product to prevent injuries from any line spillage. This product is ideal for trimming young grass; for tougher weeds, consider using alternative tools such as blades.