Safe to use on all optical lenses, filters, sensors and glass, the LensPen Original is designed to easily remove fingerprints, dust and grease. The concave-shaped cleaning tip is perfect for use with on convex surfaces, such as lenses, and a retractable brush makes it easy to sweep particles away. The non-liquid cleaning compound means better control while removing dust, and it's designed to never dry out. Simply replace the cap after using the LensPen to ensure the surface of the cleaning tip is refreshed and ready for next use.