Specification:Item Type:MotorMotor Diameter:8.5mm / 0.33inMotor Length:20mm / 0.79inOutput Shank:1mm / 0.04inOutput Shank Length:5mm / 0.2inTail Circuit:12cm / 4.72inWeight: 5 g / 0.18 oz(approx.)Voltage:3~5VCurrent:0.15ARotation Speed:3V:35000-37000 RPM5V:50000RPM (Approx.)PackageList:2 x MotorNote:1. The color of the line is black and white and red and blue. The black and white line is forward, the red and blue lines are reversed. Red is positive and blue is negative, white is positive,black is negative, with cooling holes!2. New‑style and old‑style are shipped randomly