SCS 1000 zip top static shielding bags are 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. NOTE: Many additional custom sizes are available. Please contact us for more information if your desired size is not listed. - 1000 zip top transparent metal-in static shielding bag is designed to provide a static safe environment for sensitive electronic devices. Bags are printed with an ESD protective symbol and a lot code for traceability. NOTE: Many additional custom sizes are available. Please contact us for more information if your desired size is not listed.