Product Description Item Package Quantity: 10 [Fit multiple Black + Decker string trimmer models]: LCC140, GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1100, C ST1200 & More 1. [Compatible with Black+ Decker Trimmers]: Designed for use with the Black & Decker automatic string trimmer, this spool and cap is the perfect replacement for the Black & Decker spool, 30ft Wrap replacement spool with 0.065-inch diameter line. 2. [Feed System Replacement]: Eliminates the time of manually winding the string trimmer, is compatible with Black+Decker string trimmers, and uses centrifugal force to feed the trimming string as needed. 3. [Reinforced Material]: High-quality 0.065-inch diameter reinforced nylon wire, supports fast cutting speed and longer service life. (Note: Only suitable for tender weeds. Please use a blade to trim tough weeds) 4. [Package included]: 6 replacement trimmer spools, 2 replacement spool covers, 2 springs