Aluminum housing and Copper back plate.

MIROAK is made of aluminum + copper.

There are three types of copper, and the metal coloring is done by “momentum factory Orii” using a traditional Japanese technique.

The copper on the back plate is blue “HANMON GAS SEIDOU Color”.

Each one has a different pattern and color. No two are alike.

The sound is even milder than brass and has a thicker midrange.