The ProFolio Journal Sidekick is designed to work with almost every kind of journal or notebook that is currently available in the marketplace. It truly is a one-size-fits-all pen holder. Using a patent-pending design, the pen holder attaches to journals and notebooks using two strong magnets that simply sandwich the journals front cover. Made out of a durable and modern recycled leather, the Journal Sidekick also comes with a free ITOYA BLADE ready-to-write fountain pen.