Circuit Board Kit is a traditional teaching kit and is a very basic set of simple components for the teaching of basic electricity. Originally designed in the UK as part of the 'Worcester' teaching system. The kit contains cell holders, switches, lamps, links, rectifier, resistor, potentiometer, fuse and resistance wires, electrodes, and more. The large back board has 16x strong upstanding pins and all components have rugged bronze strips that flex and can be mounted to tightly grip these pins. Circuits are created by connecting components from pin to pin.