3 Pack of 40 Gram Aluminum Silica Gel Desiccant Canister by Dry-Packs&reg; - Reuseable & Moisture Indicating Dehumidifier! Cobalt Chloride Free (Found In BLUE Silica Gel which is classified as a IARC Group 2B carcinogen.) Non-Toxic, Inert, DMF FREE, Cobalt Chloride Free, Safe & Easy To Use! Reuseable! By baking in the oven to dry out and reuse. Moisture Indicating! Window will turn from Orange (dry) to Dark Green (wet) when absorbed with moisture. Perfect to use in dressers, closets, ammo cans, storage bins, closets, cars, etc.