18 AWG enameled copper magnet wire.
Manufactured by Essex.
Heavy Build ( Two Coats ) of Insulation type: modified polyester basecoat and an improved polyamideimide topcoat.
High temperature Class: 200ºC (392ºF).
Approximately .043 inch diameter.

My primary market for my wire is for Crystal Radio Wire, Loop Antenna Wire and Ham Radio Wiring applications.

Some uses besides Crystal Radio Coils.

Generators and Alternators
Motors AC, DC, Hermetic and Fractional Integral HP Motors
Power Tools, Solenoids
Dry Type Transformers, Class 105 through 200
Electronics, All Types of Coils, Class 105 Through 200
Arts & Crafts
Inductors