Simple to use open plastic bag pour silica into cardboard shipping box and store box in your safe. Every few months dry out the silica by microwaving the box of silica! When used in closed places (where mold and fungus live and breed) silica gel whisks away moisture to create a protective environment of dry air. It prevents all forms of rust, corrosion, oxidation, mildew, fungus, mold etc. Prevents tarnish on gold and silver. Put in your toolboxes to protect your precious tools from rusting. Drop some in your camera bag to protect your valuable camera equipment. It even protects expensive leather items like jackets, shoes, and boots. Also great for tackle boxes, photo albums, computer media storage and so on. Brand new and high quality. Ideal for protecting the camera, lens, microscopes, telescopes, video tapes and computer diskettes, Ammo Widely used in precision instruments, leather, shoes, clothing. Prevent mildew. It could be placed in closets, coat or sweater inside the box to prevent mildew, etc You can reuse your used silica gel with Microwave. Heat in microwave just 5 min. (Medium / low power), Free Shipping To All US States And Territories