I recently sorted out more of my different pieces of 30 wire wall box cable.

This listing is for a good used piece of 30 conductor cable that measures about 27 feet or 8.2 meters in length.
This 1940s era cable has a cloth outer jacket and 30 solid copper conductors that have cloth insulation.

There are 28 conductors that are # 20 or # 22 AWG and 2 that are # 18 or # 16 AWG.