... ; About Silica Gel Cans:1.cobalt-free silica gel;2.tinplate box pack,beauty and versatility;3.renewable,indicate humidity ... as raw material, the body covered with small holes solid aluminum cans as a container, the product compression and strong, ... non-friable, and resistance to drop the pressure high temperature.2, Aluminum cans with a new tinplate manufacture, surface treated, smooth not ...