This is the Space Launch System or SLS Orion. This is the Block 1 model and will be used for the launch of Exploration Mission 1. This set has a total of 2509 bricks! This set also has detachable side boosters. The rocket only has 2 stages. It is 43 1/2 inches. I hope this model can be a set like the new Lego Saturn V and join the Lego NASA Rocket family. Thank you for your support!