Compatible Models: Spool model: 2900719, Cap cover model: 3411546A-6, Compatible with for Greenworks string trimmer models 2101602 and 2101602A. High Quality: ABS spool & polyamide nylon line, flexible. Aerodynamic shape allows less drag for more efficient cuts. With the auto feed system, the replacement spool eases the tedious work of hand-winding spools. Size: Cordless grass trimmer spool line diameter 0.065 inch to fits line hole perfectly. Spool line length 20ft provide a range of mowing. Easy to use and Install: Free a cap cover. Automatic winding allows you to complete spool changes quickly, saves you time and energy. Precautions for use: Wear goggles and long pants when using this product to avoid injury from spilling lines. This cordless weed eater parts refill is only suitable for young grasses. Strong weeds use other tools such as blades to trim. Easy to Install: 1. Turn off the trimmer and remove the spool cap. 2. Replace the spool into the trimmer . 3. Snap in the slot and line it up with the retainer. 4. Cover the cap. Colour: Black+Gray+Green Material: ABS, Nylon Package Contents: 4 x String Trimmer Spool Line 1 x Cap Cover Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.