This is a lot of eight (8) spools of 18 gauge, single minimum-to-nominal build MW-80 copper magnet wire, with 0.50 pounds on each spool. The enamel coating is natural in color, and the wire has an overall diameter of 0.0418". In general, magnet wire allows multiple layers of wire to be wound together without short circuiting. As such, it is useful in a variety of applications including electromagnets, transformers, Tesla coils, speakers, inductors, guitar pickups, and motors.