Compatibility: Compatible with Black & Decker GL250 GL310 GL360 82300 82310 82312 CST500 CST800 GE800 GLC12 GLC500 ST200 ST300 ST100 000 ST. 3000 ST4000 ST4050 ST4400 ST4500 ST5000 T6500 ST6800 ST7600 Save Money and Time: The aerodynamic shape allows for less drag for more efficient cuts. With the automatic feed system, the replacement spool makes the tedious work of hand-wound spools easier. Premium Quality: Made of twisted and synthetic copolymer nylon resin, soft and flexible that allows the line to stretch and cushion the impact on hard surfaces. Healthier and Greener: Ideal for your lawn. It is superior to the standard round line by producing an improved cutting action, which helps keep the lawn healthier and greener. Buy without risk: the package includes 4 pieces of cutting line. It is not manufactured or sold by Black + Decker, but has the same performance as the original. For any reason you are not completely satisfied, you can request a replacement or a full refund.