Fascinating to look at, fun to use. To assemble, pop the 52 laser-cut pieces out of the wood sheets and follow the included instructions. No glue, tape, or tools required. Finished size 7"w x 7"h x 3 ½"d. Ages 14 and up. To see a particular month, rotate the year gear, then the month gear. Because of space restrictions, year gear shows 2018-2040. So the calendar is good for the next 20 years.