These are multi-story residential and commercial buildings in 1? scale. This row of buildings can be assembled easily from 93 parts without using tools or cement. The assembly time is about 2-2.5 hours. This 3D puzzle is designed for children ages 8 and above. Product dimensions: 20.8 cm x 15.6 cm x 24.0 cm / 8-3/16" x 6-1/8" x 9-7/16".