????[Compatible with Ryobi Cordless Multiple Cordless Trimmer Models] This trimmer replacement spool is compatible with Ryobi ONE+: 18V, 24V, 40V cordless trimmer models. ????[AUTO FEEDING SPOOLThe easy-to-use weed wacker cord replacement for Ryobi weed trimmers automatically feeds the trimmer through centrifugal force, reducing the hassle of manually organizing the replacement trimmer spool during work. ???? [Wear Resistant] Ryobi Weed Wacker Trimmer Cord Replacement is made of upgraded nylon polyamide material that has a tensile strength of over 100 pounds, making it 30% more durable and longer lasting than other brands. [CUTTING EFFICIENCY] Weed trimmer string for Ryobi weed chopper replacements is soft and flexible, allowing the line to stretch and cushion when impacted against hard surfaces, and increasing cutting efficiency by 50%, allowing more weeds to be cut per spool. ????[PROFESSIONAL SELLER] As a professional brand, we have an excellent after-sales service team and product quality assurance. Package includes 6 Ryobi strings, 1 spool cap. If you want the auto feed to work better, the recommended solution is to apply powder to the spool, which will provide a small amount of lubricant.