ABS spool and nylon line: The trimmer replacement line spindle is made of high quality raw materials, the ABS spool is strong enough, the nylon line is flexible, not easy to snap, fast cut and long life. Compatibility: Compatible with ryobi One+ cutters - 18V, 24V, 40v. The spool is compatible with original ryobi One+ part number ac14rl3a and the cover is compatible with ac14hca. Convenient and efficient: allows lines to stretch and cushion impact on hard surfaces , the aerodynamic shape allows for a more efficient cut with less resistance. Easy to use and install installation, no pre-rolling tools are needed, the trimmer can be inserted and removed for easy use. Precautions for use: Strong centrifugal force during use, fast cutting speed, it is recommended to wear goggles and long pants to avoid unnecessary injury. This cordless weeding parts charging is only suitable for soft weeds. It is recommended to use a blade to cut strong weeds. Size: The cordless lawn mower spool is 57*23mm in diameter and fits the line hole perfectly. 3.3m long spool line provides wider mowing range.