Shield screen bag This kind of bag can prevent the sensitive element of static electricity to be harm by the static electricity. The unique four-layer structure formed the reaction shape which can prevent the objects in the packet. It could keep apart the objects from the static electronic field. And the inner layer is made of polythene which can eliminate the static electricity. It also can prevent static electricity which is produced by the objects in the bag. This kind of bag is transparent. It could be seem the inner objects from outside clearly. The surface resistance is :between 108～1010Ω Waterfroof bag It has three functions : prevent static electricity; prevent the disturbing from the electromagnetism and prevent damp. All the products are suitable for the electronic production packaging which repuire preventing damp. The surface resistance is :between 108～1010Ω