Brand: Eventronic Features: Compatible with Greenworks Trimmer: It's 0. 065" Dual Line Replacement String Trimmer Line Spool. Fits Greenworks cordless weed whacker models: 2101602, 2101602A, STBA40B210, BST4000. To avoid buying the wrong one, make sure you order the replacement spool to fit your weed whacker. High Quality Material: Made from an upgraded nylon polyamide material with a tensile strength of over 110 pounds, the weeder spool's pliable and resilient design allows it to stretch and cushion itself against impact, resulting in increased 50%cutting efficiency. Line Feeds Automatically: Replacement spools for Greenworks trimmers are identical in appearance and function to Greenworks spools. They are single line, auto-feed wire trimmer refills reduce the hassle of manually organizing spools and function well with the trimmer. Pre-assembled Spools: This design reduces the hassle of winding up your mower with traditional line and saves more time, all you have to do is turn on your machine and put it on. It's weed season nowadays, let replacement string spool beautify your yard. Professional After-sales Service: We provide excellent after-sales service. If the spools and caps don't fit your lawn mower model, or you accidentally buy the wrong one, we will provide after-sales service guarantee (refund, replacement or assist you to solve the problem) to make you satisfied. We will get back to you within 24 hours.The Eventronic team always cares about every customer's experience. Package Dimensions: 7.3 x 5.1 x 1.3 inches Listing and template services provided by inkFrog