Product Item Package Quantity: 10 Compatible with multiple Black+Decker string trimmer 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. This spool and cover set is a perfect replacement. The 30-foot factory-wound replacement spool features a 0.065-inch diameter line. Feed System Replacement: Eliminates time spent hand-winding string trimmers. Compatible with Black+Decker string trimmers and utilizes centrifugal force to feed the trimmer line as needed. Enhanced material: Premium 0.065-inch diameter enhanced nylon line supports fast cutting and longer lifetime. Note: Only suitable for light weed grass. For tough and strong weeds, use blades to trim. Package included: 6 replacement trimmer string spools, 2 replacement spool caps, 2 springs