Compatibility: Compatible with Ryobi One + AC14RL3A. Suitable for multiple models of Ryobi cordless trimmers: 18V, 24V, 40V. Premium Material: The replacement trimmer spool line is made of high quality ABS. Not easy to break supports fast cutting and longer service life. Convenience and High Efficiency: Flexible and strong cord for cutting. Allowing the line to stretch and cushion impact on hard surfaces, the aerodynamic shape allows for less drag for more efficient cuts. Auto-Feed Replacement Spool: Compatible with the Ryobi Edger and uses centrifugal force to power the trimmer line as needed. With the auto-loading system, the replacement spool makes the tedious work of hand-winding spools easier. Package Includes: 6 packs of trimmer replacement line spools and 2 packs of spare cap covers are packed in a package for you. The spool is 11 feet in length and 0.065" in diameter and the cap fits the replacement spool.