Circuit Scribe Non-Toxic Conductive Silver Ink Pen � Award Winning Design That MNon-toxic, silver conductive ink pen - Write on any surface your regular rollerball pen will! Pen only - 1x silver conductive ink pen that can draw 60-200 meters (depends on paper and surface type) Resistance is 0.05-0.2ohms/sq/mil (2-10ohms per cm of writing) The most successful conductive ink pen - funded on Kickstarter by over 12,000 backers!