Model: N20 motor
Body length: 15MM
Body diameter: 12MM
Motor height: 10mm
Shaft diameter: 1MM
Shaft length: front 5.5mm(from panel), back 6.7mm back shaft
[Voltage]: 3.0V-12V
Voltage    Speed (no load)    Current
3.0V      4600rpm         15 ma
6V       10000 rpm        20ma
9V       15000rpm         25ma
12V      20000rpm         30ma

Model: N30 motor
Body length: 20MM
Body diameter: 12MM
Motor height: 10mm
Shaft diameter: 1MM
Shaft length: front 4mm(from panel), back 4mm back shaft
[Voltage]: 3.0V-12V
Version: 12V 15000RPM (no load about 13mA)

Version: 12V 20000RPM (no load about 30mA)