Bridge Street Toys is a privately owned toy company that manufacturers and sells educational building sets. The Girder and Panel, Bridge and Turnpike, and Hydrodynamic buidling sets are one of their great products. The Girder and Panel, Bridge and Turnpike, and Hydrodynamic buidling sets are powerful tools for teaching children the basic principles of designing structures, cantilevers and bridges, and fluid dynamics. These are great products and they are thrilled to be able to make them available once again.