I purchased the 1/2" wire loop (black) package for a limited edition of handmade artist books. I'm a retired photography & graphic design teacher. For years, I've made artist books combining original black & white photography, typographic design and bookmaking materials. The 1/2" wire loops were used to bind a series (editions) of books documenting the decay of abandoned farm trucks. The 'pages' of the book were 1 ply Bristol boards with photographs and text mounted using archival adhesives. The 1/2" loop worked flawlessly. The design required each page to lay flat when opened. The viewer is able to flip the pages without any pages bunching up or catching on the closed loop. I would advise any customer binding booklets to use this product without reservation. The product made an unusual binding requirement easy to accomplish. I didn't need to worry about the product's ability to do what it was designed to do.