Desiccant Silica Canister provides lifetime protection for cases containing guns, cameras, telescopes and musical instruments. Also, ideal for tool & tackle boxes and silver drawers - any small storage area. The mini canister contains 40 grams of silica gel in a compact aluminum canister that measures 4" x 2" x ½", about the size of a deck of cards. Protects 3 cubic feet of enclosed space.