The white Lens Pen Professional is a small lightweight pen-shaped cleaning tool designed for camera lenses & other optical items. Its 0. 44 cleaning tip is slightly concave making it especially compatible with the convex shape of lenses on digital SLR cameras binoculars rifle scopes & more. A retractable brush is built-in for dust removal. The enhanced invisible carbon cleaning compound contains no liquid & is designed to never dry out. Put the replenishment cap back on after using the Lens Pen & it will refresh the surface of the tip assuring that only cleaning compound not grease will touch the lens on the next cleaning. This cap allows for a lifetime of about 500 uses.