A complete classroom set of basic electrical components designed with both quality and economy in mind. The teacher’s guide contains activities for designing and building simple circuits, switches, series and parallel, circuits, motors and buzzers. Each kit consists of: 16 economy bulb holders, 16 economy switches, 16 miniature bulbs, 30 wire connectors, 16 battery holders, 16 ‘D’ cell batteries, 2 motors, 2 buzzers, and a teacher’s guide packaged in a CaddyStack™. Ages 13 and up.