Learning circuitry is now as intuitive as using a pen. Our non-toxic, conductive ink enables you to draw freeform, working circuits and connect magnetic modules between your drawings to activate lights, sounds, motors & more! Geared towards fundamental electronics and physics lessons, the complexity of the concepts ranges from beginner to advanced circuitry. The Intro Classroom Kit is an accessible and fun way to introduce circuitry to classes of 25-30 elementary through high school students.  Complexity grows as your knowledge grows, allowing you to explore topics in the guided workbook and the AR App -  CS Circuits. (iOS & Android). With 30 pens and 110 modules, its perfect for 1-to-1 and collaborative learning groups. Modules: 25 9V Battery Adapters 5 USB Adapters 50 LEDs 25 Switches 5 Buzzers 25 Multi-Colored LEDs 25 Dimmers 5 Double Switch 25 Motors & Foam Wheels 5 Dials 25 Blinkers 5 DIY Connectors 25 NPN Transistors 5 Light Sensors 50 Connector Cables (five 10-Packs) Pens & Accessories: 30 Circuit Scribe Conductive Ink Pens 25 Steel Canvases 25 Stencils 1 Inventor's Notebook 1 Jumper Sticker Sheet