Litz wire is a special type of enamelled wire widely used for high frequency coils. It consists of a construction of single enamelled wires stranded together. 

These wires increase the surface area of the conductor, thereby reducing the "skin effect" and associated power losses when used with high-frequency applications. 

When the number of wires is high, the construction of litz wires can also consist of multi-litz wires, where a number of litz wires are stranded again. In this way, it is possible to have a litz wire of more than 1,000 individual wires. 

Litz wire coils are used in the construction of color monitor tube assemblies, high frequency transformers, electronic ballasts, switch mode transformers, induction cooking equipment, photocopy equipment and more.