N20 gear motor:Body Length(Including Reduction Box):25mmShaft Diameter: 3mm， D ShaftShaft Length: 10mmVoltage: 6VNo-load speed: 60rpmTorque: 1.5kg/cmRubber Wheels:Diameter: 43mmThickness: 19mmAperture: D Shaft 3mm holeMaterial: ABS engineering plastics+import rubberPackage Included:1 x N20 Micro Gear Motor with Rubber Wheels 6V For Robot Smart Car