Spool model: SF-080 / SF-080-BKP. SF-080 Spool Compatible with most Black & Decker 7.5-Amp Electric string trimmer models: GH3000 GH3000R LST540 LST540B High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. Utilizes centrifugal force and aerodynamics to reduce drag and achieve fast cutting. Package includes: 10 x String Trimmer Spool Size: Line length 20ft, diameter 0.080 inch Color: Black spool with green line Material: ABS spool, nylon line Tips: 1)Wear safety goggles and long pants when using this product to avoid injury from spilling lines. 2)Unplug tool before changing, installing, or removing accessories. 3)This cordless weed eater parts refill is only suitable for young grasses. Strong weeds use other tools such as blades to trim.