Plastic pull-tight seals with a metal insert are a type of tamper-evident security seal that combines the flexibility and ease of use of plastic seals with the added security of a metal locking mechanism. These seals are designed to provide a higher level of security compared to standard plastic seals by incorporating a metal insert that makes tampering more difficult.

The body of the seal is made from durable plastic, while the locking mechanism contains a metal insert. Any attempt to tamper with or remove the seal will break the seal or show clear evidence of tampering, as the metal insert adds an additional layer of security.