8 Inch Fixed Length Plastic Seals offer a tamper evident solution for sealing truck trailers, containers, postal service bags, and various other cargo holds. Made of polyethylene these security plastic seals have a breaking strength of up to 55 lbs. and come laser etched with 7 digit sequential numbers. To use simply press the end of the seal into the head of the cable seal to activate the locking mechanism. Requires a cutting tool to remove.