Compatible with Multiple Ryobi Cordless Corded Trimmer ModelsThis corded trimmer replacement spool is compatible with Ryobi ONE+ cordless corded trimmer models: 18V, 24V, 40V. Auto Feed SpoolEventronic Weed Wacker Line Replacement for Ryobi Weeder is easy to use, it automatically feeds the trimmer by centrifugal force, reducing the pain of manually sorting the replacement spool while working. Wear-ResistantEventronic Corded Trimmer Replacement for Ryobi Weed Eater is made of upgraded nylon polyamide with over 100 lbs tensile strength, 30% more durable than other brands and longer lifespan long. Cutting EfficiencyEventronic weeder line for Ryobi weeder replacement is soft and flexible, allowing the line to stretch and cushion when hit by hard surfaces, and increases the cutting efficiency of 50%, allowing each spool to cut more weeds. Professional sellerAs a professional brand, we have an excellent after-sales service team and parts quality assurance. Package contains 9 Ryobi strings, 2 spool caps. If you want better autofeed, the suggested solution is to apply powder to the spool, which will provide a small amount of lubricant.