Oxygen absorbers are small packets that contain an iron powder. The packets are made of a material that allows oxygen and moisture to enter but does not allow the iron powder to leak out. The Oxygen Absorbersare safe to place on top of the food. Oxygen Absorbers are used to remove oxygen from within a sealed environment, creating a nitrogen environment for long-term food storage. They protect dry foods from insect damage and help preserve product quality. They are used when dry foods are packaged in sealed containers.