Pull tight security seals offer a tamper evident solution for sealing truck trailers, containers, and various other cargo holds. Excellent for fire extinguisher security seals, garment plastic seals, gas tank seals, pull tight money bag seals and any self-locking seal use. Made of polyethylene these security plastic seals have a breaking strength of up to 8 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.