Compatible Black & Decker String Trimmer Models:CST500, CST800, GE600, ST200, ST300, ST3000, ST1000,ST400, ST4000, ST4400, ST4500, ST5000, ST6500, ST6800. Spool Model:RS-136/RS-136-BKP/143684-01. Spring model: 68223500,Cap model: 682378-02 Each spool is pre-wound 20 feet and 0.065'' diameter. High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. Aerodynamic shape allows less drag for more efficient cuts. Note:1. be sure to wear goggles, wear long pants, and avoid line spilling and hurting people;2. Stay safe: Turn off the trimmer before replacing, installing, or removing the spool. Quality Assurance: If you have any quality problems, please feel free to contact us, we will provide appropriate solutions within 24 hours.

❤️Compatible Black & Decker String Trimmer Models:CST500, CST800, GE600, ST200, ST300, ST3000, ST1000,ST400, ST4000, ST4400, ST4500, ST5000, ST6500, ST6800.

❤️Spool Model:RS-136/RS-136-BKP/143684-01. Spring model: 68223500,Cap model: 682378-02

❤️Each spool is pre-wound 20 feet and 0.065'' diameter. High-quality ABS spool & durable polyamide nylon thread, flexible and long service life. Aerodynamic shape allows less drag for more efficient cuts.

❤️Note:1. be sure to wear goggles, wear long pants, and avoid line spilling and hurting people;2. Stay safe: Turn off the trimmer before replacing, installing, or removing the spool.

❤️Quality Assurance: If you have any quality problems, please feel free to contact us by email, we will solve the most perfect solution within 24 hours.