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Jack's has the best Trimmer Line for your string trimmers! Check out our large selection of Universal trimmer line brands. These trimmer lines fit all types of trimmer heads. The most common styles of trimmer line are multi-sided, round, serrated, and twisted. Multi-Sided Trimmer Line:Trimmer line with multiple sides (square, 5-point, 6-point) always lead with a cutting edge to easily slice through heavier grass and weeds. Round Trimmer Line:This is the basic style of trimmer line that uses a flexible round-shaped line to cut. Serrated Trimmer Line:With serrated edges that act like teeth, this line quickly saws through thicker grass blades, while leaving a cleaner trim. Twisted Trimmer Line:Twisted trimmer line is a step up from the round style line. Twisted line adds strength, improves efficiency, and reduces noise and vibration levels. Some of our popular brands include Flexiblade, Gatorline, Nylium Starline, Titanium Force, Super Blue, and The Edge, plus several other brands of trimmer line from Husqvarna, Oregon, and Silver Streak. Choose your new trimmer line below!