Leupold Lens Pen, Retractable Natural Hair Brush, Microfiber Cleaning Tip With Compound 48807 This compact, two-step Lens Pen has a natural hair brush which is fully retractable for protection when not in use. A clean brush is key because it's the first thing to touch the lens. The microfiber cleaning tip automatically replenishes itself with a state-of-the-art dry cleaning compound. Compact and ergonomic, it's great for your workbench, the range, or in the field.