This 12" x 12" undated, unbound calendar is part of PhotoPlay's Maker's Series Collection. This pack includes 12 sheets of 12" x 12" paper that include a 10" x 10" page for your calendar. Each month is labeled, as are the days of the week, but no numbers, so you can create your own style for each month of the year. This paper is acid and lignin free. This paper is made in the USA.