Usage Tips:This Replacement Grass Trimmer Line Spool Set Is Designed For Worx Weed Eater. With The Auto Feed System, The Replacement Spool Eases The Tedious Work Of Hand-Winding Spools. The Spool Compatible With Worx Utilizes Centrifugal Force To Feed The Trimmer Line As It Is Needed. 10FT/ 3.1M Weed Eater Edger Line String Easily Cuts Through Grass And Weeds. Strong Toughness, Not Easy To Break, Necessary For Garden Mowing. Use Tips: Always Wear Eye Protection. Unplug Tool Before Changing, Installing, Or Removing Accessories. Choking Hazard, Small Parts Keep Away Children Under 3 Years. Only Suitable For Tender Weed Grass. Tough And Strong Weeds Please Use Blades To Trim. Does Not Fit Any Other Of String Trimmers. Specification: Type: Trimmer Spool For Model:Wa0010 Spool Material: 70% Nylon + 30% Glass Fiber Grass Rope Material: Nylon Spool Line Size: 4x1.8cm/1.57x0.71inch Spool Line Weight: 15g Spool Length: 3.1m*1.65mm Applicable Worx System: Wg150, Wg151, Wg151.5, Wg152, Wg153, Wg154, Wg155, Wg155.5, Wg156, Wg157, Wg160, Wg160.1, Wg160.2, Wg163, Wg165, Wg175, Wg180 Package Included: 20 x Spool Line 2 x Cap Cover