[Spool Specification]: Compatible with Black+Decker spools with cap, 30 feet 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 and Decker spools via CNC machine cutting and winding, automatic line change. Manual rewinding 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 line, flexible and long-lasting. Uses centrifugal force and aerodynamics to reduce drag and achieve fast cutting. [Usage Precautions]: When using this product, protective measures should be taken to avoid body injury caused by spilled lines. The product is only suitable for young grass. For strong weeds, use other tools such as knives for trimming. [Compatible Models]: Compatible with Black Decker string trimmers: GH900, GH600, LSTE525, LST300, BESTA510, LCC340C, LST522, ST8600, ST7700, ST601000, 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.