Durable to Use: The trimmer line spools are made of quality ABS spool and durable polyamide nylon thread, not easy to break, have longer service time, flexible and durable to serve you for long time.Grass Trimmer Accessories Compatible with: This trimmer replacement spool is compatible with for Black and Decker GH3000, GH3000R, LST540, LST540B, suitable for variable fields such as courtyards, lawns, gardens, etc.; Please check the compatibility before purchasing.Eases the Tedious Work: The autofeed system replacement spool eases the tedious work of hand-winding spools; Grass eater spool line utilizes centrifugal force and aerodynamics to reduce drag and achieve fast cutting, help you save time and energy, and improve the efficiency of work.Precautions for Use: Please wear safety goggles and long pants when using this product to ensure your safety, and unplug it before changing, installing, or removing accessories; Please note that our product is only suitable for young grasses, don't use it to clear strong weeds.Size: 20ft length, 0.080 inch diameterColour: as shownMaterial: ABS, nylonPackage Contents:9 x String Trimmer Spool Line1 x 90583594 Cap Covers PartsOnly 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.