These security tapes are a great way to identify tampered goods and prevent pilferage.These tamper evident tapes have a 3.9 mil thickness which is for heavy duty carton sealing. These tapes have a strong pressure-sensitive adhesive that will keep your packages securely closed. These tapes are bilingual, blue in color, and are sold by the roll. At Custom Printed Tape Supply we carry a wide variety of security tapes for your packaging needs.