It's never too early to encourage a love of STEM! This building set will inspire future engineers and architects to create their own cranes, bridges and skyscrapers. They can use their own critical thinking skills to design one-of-a-kind structure or use the included activity cards for design challenges. Includes 89 easy-to-assemble pieces and 11 activity cards. (100 pcs. per set) Platform, 4 1/4" x 4 1/4".