The Greenworks Ultra Twisted String Trimmer Line Replacement is a commercial-grade twisted cordless string trimmer line that outperforms other lines on the market. It delivers up to 15% longer runtime for cordless battery string trimmers. An aerodynamic twist shape reduces line resistance and vibration, keeping the trimmer from slowing down, using less battery energy allowing more cutting time. Engineered to deliver maximum durability and last 50% longer than residential trimmer line. That means cutting more with fewer stops to get the job done faster. Compatible with string trimmers using 0.080 in. diameter line. Greenworks cordless battery string trimmers provide constant, fade-free power with battery-powered technology to provide gas-power equivalent performance without dangerous emissions, smells, hassles or maintenance. With hassle-free, push-button starts you'll get to work fast, with no priming, no choke and no pull cord. Powered by Greenworks.