EMPIRE Flexible Silicone Skin Black Case for Sprint LG Optimus G LS970 E975 Specially designed Flexible Silicone Skin Black Case for Sprint LG Optimus G LS970. 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.