EFFECTIVE CONDUCTIVE PEN - Our conductive ink pen is the perfect electric circuit pen tool for electric science kit from Circuit Scribe such as the Basic Kit, Basic Kit Plus, Super Kit, Super Kit Plus, and more! | NON-TOXIC SILVER INK - It contains 1ml of silver electric ink that's safe to use by kids ages 8 years old and above. This pen is the perfect replacement for our kits once the existing pen runs out. | PACKAGE INCLUDES - This package comes with a single Circuit Scribe conductive ink pen that can draw from 60-200 meters depending on the paper surface or other surface types. | MULTIPURPOSE CIRCUIT PEN - It features a resistance of 0.05-0.2ohms/sq/mil or 2-10ohms per cm of writing, making it the most successful conductive ink pen funded on Kickstarter by over 12,000 backers! | CIRCUIT SCRIBE CONFIDENCE - Designed by a team of Ph.D. graduates from UIUC & Harvard, Circuit Scribe puts the power of electricity into a pen, making the joy of creating circuits accessible to anyone. We're as curious as ever and committed to inspiring that curiosity in future engineers and inventors.