Wire-O booklet binding 2

https://charlie-wiki.win/index.php/Smart_Booklet_Printing_for_Events:_What_Every_Organizer_Should_Know

Wire-O booklet binding uses a series of curved metal wires punched through a stack of pages and covers, creating a secure hinge that allows the book to lie flat when open. It is popular for calendars, portfolios, and reports because the pages turn smoothly and the binding is durable enough for frequent use. The wires come in different diameters to accommodate various page counts, and the exposed metal spine can be left neutral or matched to your brand colors for a polished, professional look.