Seals can be categorised into two main groups accordingly to their functionality:

1. Decorative and indicative seals
2. Security seals

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Numbered security seals

Decorative seals do no need numbering, since their functionality is mainly that of dressing a box up and making it more appealing, while security seals absolutely need numbering to guarantee they are univocal and not replaceable.

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Metallic numbered seals

Numbered seals can be manufactured in plastics, metal or as self-adhesive numbered labels.

To increase the security level of a seal, bar coding or data matrix printing on it is also recommended.


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Numbered security labels

This kind of marking enables automatic identification techniques, thus minimising the human error introduced by operators.