Circuit Scribe’s Conductive Ink Pen makes teaching your students about circuits and conductivity as simple as doodling on a piece of paper. Use the pen to draw smooth lines with conductive silver ink, then connect a battery and watch your creation come to life. All you need to create a simple circuit is a coin battery, LED and a paper clip. The Conductive Ink Pen works best on printer paper, photo paper, construction paper or cardstock. Replacement pen for Circuit Scribe’s Basic Kit, Maker Kit and Ultimate Kit.