Build 13 different bridge models, one-at-a-time. Set includes activity cards with real-life photo and key facts. Models demonstrate 7 key bridge types: beam, truss, arch, cantilever, suspension, cable-stayed, and movable/bascule. 207 pieces support 3 students working in a team. Comes packaged in a strong plastic storage case with dividers and lockable lid. Gr. 3-6.