MPERO Collection Flexible Silicone Skin Glow in the Dark Green Case for Samsung Galaxy S II Skyrocket I727 Specially designed Flexible Silicone Skin Glow in the Dark Green Case for Samsung Galaxy S II Skyrocket I727. 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. MPERO is a protected trademark.