These retail at Home Depot for about $50, they are super tough! Plus it comes with the adapter you may need to connect it to just about any straight shaft weed eater so you don't have to buy that separately!
Brand new in its original, unopened packaging, this ECHO Rapid Loader 3-String Replacement Cutting Head, (50% more cutting power than 2 string models), is a universal trimmer upgrade designed to fit a wide variety of curved and straight-shaft gas trimmers from major brands straight out of the box, like ECHO, Stihl, Husqvarna, Ryobi, and Homelite. This heavy-duty, 3-string head eliminates the frustration of winding spools by allowing for lightning-fast, hassle-free line reloads without any disassembly. The complete kit comes ready to install with pre-cut trimmer line and all necessary universal adapter nuts and bolts included. It is available for pickup just outside of Coffeeville, MS and I accept cash or cashapp.