Non-toxic and leak-proof, the Rem Dri 35 Dehumidifying Desiccant eliminates odors and removes moisture to prevent rust and corrosion in gun safes, cabinets, carry cases, ammo bags or other enclosed areas. Easy to read indicator dot turns from blue to pink when product needs to be replaced. No electricity required. Rechargeable for multiple uses. The tear-resistant Tyvek packaging is leak-proof and the weight is 450 grams/16 oz.