Empire Silicone Skin Purple Case for Motorola DROID RAZR M XT907 Specially designed Silicone Skin Purple Case for Motorola DROID RAZR M XT907. 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.