Circuit Scribe Non-Toxic Conductive Silver Ink Pen – Award Winning Design That Makes Creating Circuits and Switches Easy As Doodling – Writes on Any Paper!
Amazon.com: Circuit Scribe Non-Toxic Conductive Ink Pen for Kids Circuit Building Set (2-Pack) | Silver Ink Rollerball Point Pen Kit, Science Experiment, DIY Science Projects (New & Improved Formula) : Office Products
Circuit-Scribe Circuit Scribe Pen, 10-Pack at Lowes.com