Pull tight security seals offer a tamper evident solution for sealing truck trailers, containers, and various other cargo holds. Easily seal mail bags, courier bags and money bags with these tamper evident seals. Made of polyethylene these security plastic seals have a breaking strength of up to 46 lbs. and come laser etched 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. Requires a cutting tool to remove.