FUNCTIONSBinding sheets up with Plastic Helix Binding Loop and the special binding machine. Scope:transaction,handle book,calendar,teaching materials and so on. Strongpoints1.Innocuity,smellless, clean products.2.Fixed sheets smoothly and can turn over 180 degree. never turn over at will for pass through after binding up, and it know from other binding mode.3.Convenient and shortcut working procedure.4.Sheets never fall off after binding up.5.Pictures and words in different pages can combine symmetrically.SIZEClassified according to numbers of binding pages:1. 3 2. 5mm 3. 7.5mm 4.10mm 5.12.5mm 6. 15mm7. 17.5mm 8. 20mmSeven kinds of colors: White, Black, Red, Blue, Green, Yellow, TransparencyPACKAGEFinished product adopts Bulk Pack. We can pack and printing on inside and outside box according to clients' any special demand.