Compatibility: Compatible with Ryobi One + AC14RL3A. Suitable for several models of Ryobi cordless trimmers: 18V, 24V, 40V. Premium Material: The replacement line 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. Auto-Feeding Replacement Spool: Compatible with the Ryobi String Trimmer and uses centrifugal force to power the trimmer line as needed. Package Includes: 8 packs of replacement trimmer line spools and 2 packs of spare cap covers are packed in a package for you. Coil diameter: 5625 mm and straw rope: 3.3M1, 65mm replacement coil. Material : ABS and nylon polyamide Three Sizes to Choose Step 1 Stop the engine and brake the cap. Step 2 Replace the spool in the cutting head. Step 3 Align the retainer with the solt on the outside of the head. Step 4 Cover the trimmer cap. Unplug the tool before changing, installing or removing accessories. Choking hazard, small parts away children under 3 years. ONLY suitable for tender weeds. Hard and strong weeds, please use blades to cut.