Features: brand new and high quality The conductive paint pen will quickly dry off on the paper to form a conductive metal film, so as to generate a circuit diagram. Once an electronic circuit is formed, the LED light on the paper can be illuminated. Suitable for physics teaching, circuit design, circuit wiring, circuit experiment, luminous card, etc. The conductive paint pen is mainly composed of silver conductive copper mixed powder and nickel powder, which has good conductivity. Strong conductivity, strong adhesion, stable performance and simple operation. It is not suitable for use on the skin. Do not use your own skin as a circuit. Specifications: Material:Plastic Length:12.7cm/5.00inches Package Includes: 1 x Circuit Repair Conductive Paint Pen note: Please allow 0-1mm errors due to manual measurement, make sure that you do not mind before you order.