Circuit Scribe Developer Kit: Draw Circuits Instantly Non-toxic, silver conductive ink pen - Write on any surface your regular rollerball pen will! Our largest kit includes 37 magnetic modules to create functional circuits on paper Includes Circuit Scribe Workbook + Sketchbook, 2x 9V battery, 2x steel sheet, stencil and accessories The most successful conductive ink pen - funded on Kickstarter by over 12,000 backers