Product InformationNanoblock. The original micro-sized building block. For the construction set fan seeking a superior building experience, Nanoblock offers a greater challenge, sophistication and detail than any other system. Create exquisite 3D works of art with incredible realism and authenticity. Amazingly small bricks mere millimeters in size and manufactured to the highest tolerances for a secure fit, you can build display worthy sculptures that can fit in the palm of your hand. Execute the finest details as you build precise models with astounding results.Orbit the earth in this solar powered NASA inspired space station.# of pieces: 130Ages: 12Difficulty: Based on a scale from 1 to 5. 1 being the easiest and 5 being most advanced. This model is based at a Level 3.