Fits for Ryobi One Plus+ weed eater : 18 Volt 24V 40V electric string trimmer edger. Replacement for Ryobi One Plus+ spools by the CNC machine cutting and winding, automatic line change. Manual winding is cumbersome and can easily get stuck during use, which can cause damage to the string trimmer. High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. Use centrifugal force and aerodynamics to reduce drag and achieve fast cutting. Twisted line for added strength and durability It is easy to remove the old cartridge and replace it with a new pre-wound cartridge. This quick, easy solution is ideal for all Ryobi cordless trimmers with an auto-feed (single line) string head.