Material: ABS Color: Blue Quantity: 10 piece set (8 spools+2 covers) Packaging Content: 1 set of lawn mower accessories 1. ABS material - Edge trimming machine replacement rope axis is made of high-quality raw materials, the ABS spool is strong enough, the nylon rope is flexible, strong enough, and has a long service life. 2. Compatible with Ryobi One+string trimmer -18V, 24V, 40V. The spool is compatible with Ryobi One+original part AC14RL3A, and the cover is compatible with 522994001, 3411546-7G, AC14HCA.3. Precautions for use - During use, centrifugal force is strong and cutting is fast. It is recommended to wear goggles and long pants to avoid unnecessary injuries. This cordless grass suction part filler is only suitable for tender weeds. It is recommended to use a blade to trim strong weeds. 4. Save work time, easy to use and install, pre wrapped without tools, can insert and remove trimmers, easy to use, durable, saving you time and effort. 5. The automatic system is easy to assemble and use. Compatible with Ryobi line trimmer and using centrifugal force to feed the trimmer line as needed. With an automatic system, backup spools make the tedious task of manually winding spools easier. The lawn mower will not clog when mowing.