Empire Flexible Silicone Skin Black Case for LG Google Nexus 4 Specially designed Flexible Silicone Skin Black Case for Google Nexus 4. 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.