Compatible with Ryobi Cordless Lawn Mowers: This replacement lawn mower spool is compatible with Ryobi ONE+ cordless lawn mower models: 18V, 24V, 40V. Automatic Feed Spool: The replacement lawn mower spool is suitable for Ryobi lawn mowers. It is easy to use and automatically feeds the mower using centrifugal force, reducing the trouble of manually sorting the replacement mower spool during work. Wear-Resistant: The replacement lawn mower cord is made of upgraded polyamide nylon, which has a tensile strength of over 100 lbs, is 30% more durable than other brands, and has a longer service life. Cutting Efficiency: The alternative trimmer line is soft and flexible, allowing the line to stretch and cushion as it is Hits hard surfaces and increases cutting efficiency by 50%, allowing each spool of line to cut more weeds. Pack includes 10 Ryobi lines and 2 spool covers. If you want the automatic feed to work better, the recommended solution is to apply powder to the spool, which will