One key in maintaining and extending the life of your flashlights is to remove any chances of water or dust getting inside your flashlight. Our silicone grease helps by providing your flashlight with the seal they need to stay airtight and dust free. Made specifically for lubricating surfaces that may be conductive. This lubricant can be spread on the o-rings of any flashlight to help create a tighter seal. Ultra water resistant, this lubricant will keep the internal components working for light years ahead!