10-Pack Replacement Spool for Black+Decker String Trimmers – Compatible with Models LCC140, GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1100, CST1200 and more Compatible with Black+Decker Auto-Feed String Trimmers – Designed as a direct replacement for factory spools, each 30-foot pre-wound spool features a 0.065-inch diameter trimmer line Effortless Feed System – Eliminates the need for hand-winding; uses centrifugal force to automatically feed the line as needed during operation Durable Enhanced Nylon Line – Premium 0.065-inch diameter line provides efficient cutting performance and extended lifespan (Note: Suitable for light weeds and grass; for thick or tough vegetation, use a blade) Package Includes – 6 replacement trimmer spools, 2 spool caps, and 2 springs