Compatible with multiple Ryobi One+ trimmer models: 18V, 24V, 40V. New Upgrade：Thick Line Diameter-2.0mm diameter and 3.5m high quality cord. Spiral Air Cutter Design-Upgraded trimmer spool for thicker and more efficient use. Makes weeding easier. Auto Feed System replacement spool saves time winding the line by hand Package Included: 8 Packs 2.0mm Replacement Trimmer Spools and 2 Trimmer Caps Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.