K'NEX Education's Intro to Structures Bridges Set allows you and your children to create a variety of shapes and models of bridges. The set consists of 207 classic pieces, which include rods and connectors. The snap-fit pieces stick together securely and can be easily reassembled into other creations. Build 13 fully functioning replicas of real-world bridges, one at a time. These models demonstrate key bridge types, such as truss, arch, cantilever, beam, suspension, movable/bascule, and cable-stayed. Building instructions and teacher's guides and experiment guides are included in each set. K'NEX Education's Intro to Structures Bridges Set is designed to enhance imagination and creativity. Aside from being used to build 13 bridge replicas, it also allows kids to create buildings, houses, and towers. This set is ideal for kids from grades 3 to 5.