【Compatibility】: Compatible with Ryobi One + AC14RL3A. Suitable for several models of Ryobi cordless trimmers: 18V, 24V, 40V. 【Premium Material】: The replacement thread 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-Feed Replacement Spool】: Compatible with Ryobi string trimmer and uses centrifugal force to feed the trimming line as needed. 【Package Includes】: 8 packs of replacement trimmer line spools and 2 packs of replacement trimmer cap covers are packed in a package for you.Spool diameter: φ56*25mm and straw rope: 3.3M*φ1.65mm replacement spool.Material: ABS and nylon polyamide Three Sizes to Choose Step 1 Stop the engine and brake the cap.Step 2 Place the spool back into the trimmer 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.Risk of suffocation, small parts keep children under 3 years away.Suitable for soft weeds ONLY.Tough and strong weeds, please use blades to cut.