GREAT CONDUCTIVITY:The main ingredient of conductive ink adopts high quality mixed conductive metal powder of silver,copper and nickel. It can conduct electricity in two or three minutes after the ink dried. FEATURES:Superior performance,strong adhesion,easy to use. After coating on the surface of the item,it will quickly form a conductive metal film in a few minutes. Then you can attach the colorful LED lights or batteries on painting traces. WARM TIPS:Please shake the pen gently before using. And Keep it painting stably constantly and without interrupting.Length 5''. Lightweight and easy to cary. Super stable performance. You can imagine the lines painted with conductive ink as liquid wires,and you can combine your own creativity to draw vivid circuit patterns. VERSATILITY,PRACTICALITY:Wide scope of applications:physics lessson teaching,circuit design,DIY circuits,circuit experiment,luminous musical card production,and more. Available painting materials:cardboard,glass,ABS,PVC,PS,PC,HIPS and other plastics. OPERATION NOTICE,STORAGE. Air drying method:natural air drying within 5-10 minutes. Best electrical conductivity when completely dry. The thickness of the paint film is not less than 20 micrometre. Keep away from your skins,fire,for sun lighting,etc. Please close the cap after using.