These are flat opaque ESD bags, open on one end. Heat sealable. Ideal for protecting static sensitive components from damaging electrostatic discharge. These bags are made from Protect VF 1000, and opaque, heavy-duty material that acts as a Faraday cage around contents when properly heat sealed into a bag or pouch. This film provides both electromagnetic and electrostatic shielding for superior protection of electronic components. These static shielding bags are designed to protect electronic components during shipping and storage.