This listing is for 1 wooden perpetual calendar and 1 moon calendar. A circular spinning perpetual and moon calendars hang from the wall like a picture would on a nail or a screw. The rings turn manually so there are no small parts to break. I'm super happy how those 2 calendars look together. And now you can not only track the date with your little one but also the moon phase The outer perpetual calendars ring is 11.5" in diameter so this is a substantial size. Both of them are made with cherry for the rings, maple and poplar for the dial window and images are printed directly into the wood.