[Spool Specification]: Compatible with BLACK+DECKER spools with cap covers, 30ft 0.065 inches, compatible with original spool models AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. [Professional CNC Winding Spool]: Compatible with BLACK+DECKER spools, precision-cut and wound using CNC machinery for automatic line change. Manual winding is cumbersome and may cause jams during use, potentially damaging the string trimmer. [Rugged Material]: High-quality ABS spool and durable polyamide nylon thread, flexible and long-lasting. Utilizes centrifugal force and aerodynamics to reduce drag and enable fast cutting. [Precautions for Use]: When using this product, wear appropriate protective gear to avoid injury from broken or flying line. This product is designed for trimming light grass. For thick or woody weeds, use alternative tools such as blades. [Compatible Models]: Compatible with BLACK+DECKER string trimmers: GH900, GH600, LSTE525, LST300, BESTA510, LCC340C, LST522, ST8600, ST7700, ST7000, ST6600, NST2118, NST2018, NST1118, MTE912, MTC220, LSTE525BT, LSTE523, LST420, LST400, LST220, LST201, LST140C, LST136W, LST136B, LST136, LCC222, LCC221, LCC140, GH912, GH610, GH500, GH400, CST2000, CST1200, CST1000, BESTE620, BESTA512.