Handcrafted one ring at a time. This is my Blue and Silver Owlet Owl Chain Mail Hook bookmark. The little owlet is smaller than an American dime! The hook goes in the book to mark your page and hooks over the spine of the book to keep it secure. And the pretty chainmaille piece dangles to give your book a bit of bling. Tested in various sizes of books and has worked well in all sizes as well as paper back and hard cover.