Item Package Quantity: 10 Fits 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 Trimmers: Designed for use with Black & Decker auto feed string trimmers, this spool and cover are a perfect replacement. 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 trimmer and utilizes centrifugal force to feed the trimmer line as it is needed Enhanced Material: Premium 0.065-inch diameter enhanced nylon line supports fast cutting and longer lifetime. Note: Only suitable for tender weed grass. Tough and strong weeds please use blades to trim Package Included: 6 replacement trimmer string spools, 2 replacement spool caps, 2 springs