The Greenworks 0.065 single line spool is pre-wound and conveniently ready for whenever you need replacement trimmer line. Easy to remove and install， this replacement spool works with our auto-feed trimmers to automatically adjust the trimmer line length to the appropriate cutting diameter. The Greenworks POWERALL™ 24V lithium-ion battery platform powers over 125+ indoor and outdoor products， including lawn mowers， blowers， string trimmers， chainsaws， power tools， vacuums and more! The 24V lithium-ion battery provides 20% more power and 35% more runtime (compared to 20-volt products) while delivering fade-free power with no memory loss after charging.