Compatible Models: Spool model: 2900719, Cap cover model: 3411546A-6, Compatible with Greenworks string trimmer models 2101602 and 2101602A. High Quality: ABS spool and durable 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 fit line hole perfectly. Spool line length 20 ft provides a wider range of mowing. Easy to Use and Install: No cap cover required. Automatic winding allows you to complete spool changes quickly, saving time and energy. Precautions for Use: Wear safety goggles and long pants when using this product to avoid injury from flying debris. This cordless weed eater parts refill is only suitable for young grasses. Use other tools for strong weeds. Installation Instructions: 1. Turn off the trimmer and remove the spool cap. 2. Replace the spool into the head. 3. Snap the line into the slot and align it with the retainer. 4. Replace the cap. Color: Black + Gray + Green Material: ABS, Nylon Package Contents: 4 x String Trimmer Spool Line 1 x Cap Cover Only the above package content is included; other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture to be slightly different from the real thing. Measurement allowance is +/- 1-3 cm.