Our tamper evident seals have an enhanced performance material that shows a clear void or open security message when the label is lifted. Initially developed for use on the doors and hatches of aircraft when they are parked overnight or in flight, however these tamper evident seals are ideally suited for use on most surfaces. This product gives visual evidence of tampering or illegal entrance on aircraft, vehicles, doors, sensitive equipment, lockers, containers, restricted areas, etc. These tamper evident seals are great for business travel.