There are 41 different holidays along with birthdays for teachers to use in their pocket chart calendars. They are shaped liked triangles to not get in the way of the calendar number. I like to write the date on the back of the triangle before I get them laminated ! so I don't forget which day they are - especially the fun ones! The triangles are 3" long by 2.25" high. They are sized to fit a larger pocket chart but if you cut the border off, you could make them smaller! I could not find a better set out there so I hope you enjoy them as much as I do!