Empire Flexible Silicone Skin Case for Apple iPod Nano 7th Gen - Black Specially designed Flexible Silicone Skin Black Case for Apple iPod Nano 7th Gen. Made from fully treated silicone. No mixes or blends. Chemically stable, even when impacted by heat or environmental impact. Insoluble in water, corrosion resistant, a virulent insipidity. EMPIRE is a registered trademark with the USPTO.