Fixed length mechanical security 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 44 lbs. and come pre-printed with 6 digit sequential numbers. To use simply press the end of the seal into the head of the cable seal to activate the locking mechanism. Removable only by bolt or cable cutters.