These files are designed with self-locking mechanisms and the files are thick enough to hold the documents and papers. These files come with cobra clip attached. These files are prepared with thick paper for a stronger protection and support to the files. These files are of A4 size and helps to store files with A4 size. The strong thick board makes the file more tear resistant. The cobra clip provides a spring to tag the files and thus the flexibility of the spring helps to adjust the tagging as per the files stored.