1. Material: Aluminum alloy pen, pure copper nib (pen tip with protective film does not hurt the screen). 2. Product Process: CNC piano paint. 3. Product diameter: 9mm. 4. Tip diameter: 1.5mm. 5. Product length: 173mm. 6. Net weight: about 35.3g. 7. Effective distance: 1.6mm from the tip of the pen. 8. Lithium polymer battery capacity: 140mAh. 9. Voltage and current: 5V/0.2A. 10. Charging interface: Micro USB.