Product descriptionQuantity of items in the package: 10[Fits several Black + Decker trimmer models]: LCC140, GH400, GH500, GH600, GH610, GH900, GH912, ST6600, ST7000, ST7200, ST7700, ST7701, ST8600, ST9000, CST1000, CST1100, CST1200 and more1. [Compatible with Black + Decker trimmers]: Designed to be used with Black and Decker automatic line feed trimmers, this spool and cover is a Black and Decker spool, a perfect replacement.2. [Power System Replacement]: Eliminates the time spent with hand-wound trimmers compatible with the Black + Decker trimmer and uses centrifugal force to feed the cutting line as needed.3. [Improved Material]: Upgraded 0.065 inch diameter nylon line, supports fast cutting and longer service life. (Note: Only suitable for tender weeds. Hard and strong weeds, please use blades to trim)4. [Package Included]: 6 times; spare thread spool, 2 times; replacement spool cap, 2 springs