How to use "casing" in a sentence

The metal casing of the radio gleamed with a brittle crust of ice

As the room grew warm again, the doorknobs and the radio casing and the other metal objects quickly shed their fragile skins of ice, leaving shallow puddles on furniture and damp spots in the carpet

On the doorknob, on the radio casing, and on other metal objects, moisture began to condense out of the air