The plastic seals group comprises self-locking sealing devices of indicatory type, made of polymer materials. They do not need any additional tools for sealing and unsealing as they are placed manually without major physical efforts. The plastic seals have high indicatory capacity, reliability, quality of manufacture and are resistant to unapproved access. They are designed mainly for cargo and goods access control during their storage and transportation. They ensure a reliable sealing with a minimum expense of time. Each seal is stamped with a unique identification number and other marks. Each seal is placed manually with no special tools used, while the unsealing is done either manually or with a pair of simple office scissors. The quality of the material that they are made of ensures their usage in various climates. The seals are resistant to chemical influence when used in aggressive environments.