Oxygen Absorbers are usde in plastic pouch bags to prevent the growth of fungi and microorganisms which can make the jerky unfit to eat. This is achieved by keeping oxygen levels inside stand up pouches or other paackaging close to zero. Aerobic(those who need oxygen to survive) bacteria cannot live in an atmosphere devoid of oxygen. So a lack of oxygen prevents the beef jerky from rotting. For manufacturers and consumers, this means fresher beef jerky which means a longer shelf life.Established in 1998, Chunwang is well-known as one of the leading manufacturers and suppliers of oxygen absorber 500cc in China. During the past two years, we have introduced advanced equipment and technology into our factory. Please be free to buy our cheap products made in China.