[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 wound spool]: Designed for compatibility with Black+Decker spools, precision-cut and wound using CNC technology for smooth automatic line feed. Avoids issues associated with manual winding, such as tangling and jamming, helping prevent damage to the string trimmer. [Rugged material]: Constructed with high-quality ABS spool and durable polyamide nylon line for flexibility and extended lifespan. Engineered to utilize centrifugal force and aerodynamics to minimize drag and enable efficient cutting performance. [Usage precautions]: Always use appropriate safety gear when operating the trimmer to protect against flying debris. This product is intended for use on light grass only. For thick or tough weeds, a blade or alternative cutting tool is recommended. [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.