Segway -Electric Circuit Conductive Ink Pen Instantly Draw Magic Pen 12ml-Golden Highlights Generic Brand Electric Circuit Conductive Ink Pen Instantly Draw Magic Pen 12ml-Golden main ingredient is silver conductive copper mixed powder and nickel powder, conductive effect 0.025/cm. With its superior performance, you can perform simpler or complex electronic production. Good conductivity, simplified operation, easy to use; Simple circuit repair, fun circuit building. specification: Product size: 13.5 x 1cm / 5.31 x 0.39inch Package includes: 1 piece Conductive ink pen Note: Shake well before using and you should maintain a continuous, even line when writing. If you are still not driving, you'd better check and find the break by using the multimeter.