There are a variety of container seal classification is generally 6 categories: 

1 high security seal, is a metal lock body ABS, it is difficult to open after locking. Used in containers, containers, trucks and so on, you can prove that halfway was opened. 

2 plastic seal, it is made of PP / PE and nylon, lighter and easier to use, used in banks, fire extinguishers, cargo, etc. 

3 cable seal, aluminum alloy is more commonly used, there are 6 corners, with logistics, tanker and other customs. 

4 meter seal, PC case, ABS cylinder, two copper and one steel 

5 padlock seal , PP / ABS used in containers, aircraft dining car, luggage and so on 

6 metal seals, used in trucks and so on