Wide Compatibility: Black + Decker Models: 82300, 82310, 82312, CST500, CST800, GE600, GE800, GL250, GL310, GL360, GLC500, ST200, ST300, ST400, ST1000, ST3000, ST4000, ST4050, ST4400, ST4500, ST5000, ST6500, ST6800, ST7600 The streamlined shape allows for less drag for more efficient cuts. With the automatic feed system, the replacement spool eliminates the tedious work of manually winding spools by hand. Premium Quality: Made of flexible and pliable braided synthetic copolymer nylon resin that allows the line to stretch and cushion against surfaces. Healthier and Greener - It's good for your lawn. It is superior to standard round line by producing an improved cutting action, which helps keep the lawn healthier and greener. Package Includes: 6 pieces trimmer line.