Tear Away security seals offer a tamper evident solution for sealing truck trailers, containers, and various other cargo holds. Great for mail/courier/money containers which require high security. Made of high-density polypropylene and a steel locking piece for extra hold these security plastic seals have a breaking strength of up to 73 lbs. and come pre-printed with 7 digit sequential numbers. To use simply thread the end of the seal through the closure and into the area marked "enter" at the end of the seal and pull tight. They may require additional tools like bolt or cable cutters to remove.