Thank you very much for viewing our product from among many others. This is a Kato E531 series, Joban Line/Ueno-Tokyo Line 15-car set. It is from the 2020 production run. 10-1290 Basic Set (4 cars) 10-1291 Add-on Set A (4 cars) 10-1292 Add-on Set B (2 cars) 10-1293 Attached Formation Set (5 cars) This is a 15-car set consisting of the above 4 sets. There are no cases for Add-on Set B and the Basic Set. The 15 cars are stored together in the cases for Add-on Set A and the Attached Formation Set. The antennas are already installed, but the destination display stickers and set name display stickers are unused and unapplied. Lights and motor function without issue. If you have any questions, please comment.