1. Axial length: 9mm 2. Diameter of shaft: 2mm 3. Material???ABS + brass + iron + steel 4. Rate voltage: 3V 5. Power range: 1 - 6V 6. Input voltage: 3V 7. Speed: 18800RPM ( 3V ), 32000RPM ( 6V ) 8. Working current: 100mA 9. Be used to connect to the main shaft gear and propeller, model car, model aircraft