Unlock the secrets of bridge building with Polydron Bridges. These sets give budding designers a chance to build and test several types of bridge designs, including some of the most recognisable, world-famous bridge constructions. Twelve comprehensive work cards and lesson plans provide step-by-step instructions to piece together truss, suspension, cantilever, drawbridge, cable stay, swing and bascule bridges. The set will encourage and challenge children to go beyond the set shapes and to experiment with their own creations. Age 9+.