[Spool Specification]: Compatible with Black+Decker spools with cap, 30 ft 0.065 inch, compatible with original spools models AF-100, AF-100-3ZP, AF-100-BKP, AF-100-2. [Professional CNC Winding Spool]: Compatible with Black and Decker spools by CNC machine cutting and winding, automatic line change. Manual winding is cumbersome and can easily get stuck during use, which can cause damage to the string trimmer. [Durable Material]: High-quality ABS spool & durable nylon thread, flexible and long service life. Uses centrifugal force and aerodynamics to reduce drag and achieve fast cutting. [Precautions for Use]: When using this product, protective measures should be taken to avoid injury to the body caused by spilled lines. The product is only suitable for young grass. For strong weeds, use other tools such as blades to trim. [Compatible Models]: Compatible with black decker string trimmer: GH900, GH600, LSTE525, LST300, BESTA510, LCC340C, LST522, ST8600, ST7700, ST6600, ST6000, 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.