A complete classroom set of basic electrical components designed with both quality and economy in mind. The Electricity Teacher's Guide (20814), which contains activities for designing and building simple circuits, switches, series and parallel circuits, motors and buzzers, is also included. Ages 13 +. Packaged in a CaddyStack™, each kit consists of: 16 Economy Bulb Holders 16 Economy Switches 16 Miniature Bulbs 30 Wire Connectors 1 Teacher's Guide 16 Battery Holders 16 "D" cell Batteries 2 Motors 2 Buzzers 1 guide in English.