Product Item Quantity per Pack: 10 [Fits Multiple Black + Decker String Trimmer Models]: LCC140, GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701 , ST8600, ST9000 , CST1000, CST1100, CST120 and more 1. [Compatible with Black+ Decker Clippers]: Designed to work with Black Decker Auto Feed Line Trimmers, this spool and cover is a Black Decker spool, the perfect replacement for a 30 foot factory wound replacement spool with 0.065 inch diameter thread. 2. [Feed System Replacement]: Eliminates the time it takes to manually wind the trimmer, is compatible with Black+Decker trimmers, and uses centrifugal force to power the trimmers as needed. 3. [Reinforcement Material]: 0.065 inch diameter high quality reinforced nylon wire, support fast cutting speed and long service life. (Note: For soft weeds only. Use blade for stubborn weeds) 4. [Package Included]: 6 Replacement Trimmer Spools, 2 spare spool caps, 2 springs