【Compatibility】: Compatible with Ryobi One + AC14RL3A. Suitable for multiple models of Ryobi cordless trimmers: 18V, 24V, 40V. 【Premium Material】: The replacement string 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 cable for cutting. The aerodynamic shape allows the line to stretch and absorbs shocks on hard surfaces and provides less resistance for more efficient cuts. 【Auto Feed Replacement Spool】: Compatible with Ryobi string trimmer and uses centrifugal force to drive the cutting line as needed. With the automatic loading system, the replacement spool makes the tedious work of manually winding spools easier. 【Package Includes】: 8 packs trimmer replacement line spools and 2 packs replacement cap covers are packed for you. The spool is 11 feet long and 0.065 inch in diameter, and the cap fits the replacement spool.