With this series, Sagan has created some extremely high end borosilicate marble displays, highlighting each of the 12 manned Apollo missions to the Moon that the US endeavored. Each Apollo set, which includes a Moon marble and stand, is uniquely identified to that mission, both in the Apollo mission # on the stand, and in Sagan's signature on the Moon marble. These are the most realistic Moon marbles we've ever seen, as Sagan carefully carved the texture on each moon marble to match the actual surface of our Mooon! These sets are extremely limited of course, with only 12 total to ever be available, and I am lucky to be able to sell one here on Glass ORBits! If you're as much into outer space as I am, then this Apollo Moon set is a MUST for your collection. This set represents the Apollo 9, the 4th manned mission. I have Apollo 17 in my collection, the last mission. This pieces stand a total of 4" tall.