Package includes: 6 boxes of silica gel desiccants, 40 grams each. The canister is sealed in plastic film that should be removed before use. Reusable desiccant: silica gel beads can be reactivated by placing them in an oven for 3 hours at 250 degrees Fahrenheit. Note that if the silica beads are green upon arrival, they may have absorbed moisture during transit or storage. Proper size: each silica gel dehumidifier measures approximately 4.13 x 2.17 x 0.59 inches (10.5 x 5.5 x 1.5 cm), making it easy to use and store without taking up much space. Portable tin canister: the silica gel is encased in a compact tin canister with vents and a viewing window for easy inspection. The canister is made of aluminum for durability. Protect your items: this desiccant helps protect cameras, telescope cases, toolboxes, silverware drawers, computer cases, and other small enclosed spaces from moisture. Each canister can effectively protect up to 3 cubic feet of enclosed space, ideal for use in humid environments and seasons.