If you're tired of messing with trimmer line, this ONE+ Spool is a simple and convenient solution for your RYOBI auto-feed cordless trimmer. Simply remove the old spool, replace it with the new pre-wound spool and you're ready to get back to work. The durable 0.080 in. trimmer line is optimized for cordless trimmers, efficiently slicing through weeds without compromising your battery life. This quick and easy solution is compatible with all RYOBI 18-Volt, 24-Volt and 40-Volt (RY40210 and RY40201) auto-feed cordless trimmers.