1.ABS Bobbins and Nylon Threads - The replacement bobbins are made of high quality materials, the ABS bobbins are durable enough and the soft nylon threads are tough enough for a long service life.2. Widest range of Mowing-065" replacement spools compatible with Ryobi One Plus + AC80RL3 0.065" stranded line and replacement spools for Ryobi 18V, 24V and 40V cordless lawn mowers.3.Note: When used with high centrifugal force and fast cutting speed, it is recommended to wear glasses and long pants to avoid unnecessary injury.Additionally, this cordless trimmer is only suitable for cutting weeds.It is recommended to use blades to cut weeds.4.LABOR TIME SAVING: Easy to use and install, pre-wound installation without tools, insert and remove from the trimmer, easy to use, long service life, save your time and energy.5. Compatible with Ryobi One+ trimmers - 18V, 24V and 40V. Reel is compatible with original Ryobi One+ model # AC14RL3A, cover is compatible with 522994001, 3411546-7G, AC14HCA.