The SCS 81748 Metal-In Static Shield Bag 4 in. x 8 in. 100 Count is a transparent metal-in static shielding bag is designed to provide a static safe environment for ESD sensitive electronic devices. This model has an open top and is heat sealable. The 81748 is manufactured from a polyester, metal, polyethylene laminate. The polyester dielectric in concert with the metal layer provides discharge shielding. The exterior being static dissipative allows electrostatic charges to be removed when grounded.