Leupold LensPen Cleaning System LensPen is a must for anyone who cares about protecting and maintaining the anti reflective coatings on the exterior lenses of scopes, binoculars and spotting scopes. Laboratory tests prove LensPen out performs other products when it comes to the removal of oily fingerprints: The most common and damaging contaminant to lens surfaces. The natural chamois cleaning tip is impregnated with a special non liquid cleaning compound, and is replenished. The LensPen is small and light, and it's easy to use time and again. A gentle, retractable brush is built in for the removal of dust or grit particles.