Compatiblity:0.065 string Trimmer Line and Spool FITS RYOBI ONE+ CORDLESS TRIMMERS including the 18v, 24v, and 40v trimmers--Spool compatible with Ryobi One+ original model part AC14RL3A and Cap compatible with 522994001, 3411546-7G, AC14HCA. High Quality: 0.065 replacement line: 10 pack of twisted copolymer nylon resin and synthetic trimmer/edger line(8 Replacement Line Spool, 2 Trimmer Cap) High Efficiency: Aerodynamic shape allows less drag for more efficient cuts,Auto Feed System replacement spool eliminates time spent hand-winding string trimmers USE PRECAUTIONS - Strong centrifugal force and cutting fast during using, recommend to wear eye protection and long pants to avoid unnecessary injury. And this cordless weed eater parts refill is only suitable for tender weed grass. Strong weeds will been recommended to use blades to trim.