FUNCTIONSBinding sheets up with Plastic Helix Binding Loop and the special binding machine. Scope: transaction, handle book, calendar, teaching materials and so on. Strongpoint1.Smoothness, never turn over at will for pass through after binding up, and it knows from other binding mode.2.Perfect appearance after binding up, can turn over for 360degree. raising levels of files.3.Convenient and shortcut working procedure.4.Sheets never fall off after binding up.5.Pictures and words in different pages can combine symmetrically.