3 wire red, black, and green retractable Test Lead cables, each 20 feet in length. Leads are made of 18 gauge copper wire with insulated alligator clips on each end. The alligator clips are crimped and soldered for greater reliability. The reel is easy to use - simply pull both ends of the test leads out and they will stay at the desired length. When ready to rewind, hold the top of the case and rotate the bottom. These extra long test leads are perfect for troubleshooting electrical issues in your car, trailer, boat and more. The reel measures 6.8" in diameter, 0.9" tall, and it weighs just over one pound.