low self-inductance reactance, responsive and can avoid system error. LOW NOISE: stepper motor kit is made with introduced German craftsmanship and there is rotor rubber covering the rotor, effectively reduce the noise. DURABLE & TOUGH: tough and durable. And the texture in the side wall can increase friction. WIDE APPLICATION: This small motors can be used in area, such as stage lighting; engraving; textile machinery; equipment; placement machine; non-standard equipment; 3D printer; automation equipment, and etc.. Product name: Bipolar 42 Stepper Motor Holding torque: 0.46 Nm/ 65 oz-in Working voltage: DC 9-42V Rated current: 1.7A Resistance: 2.1 ohm Inductance: 4mH Rotor inertia: 55gcm2/ 0.30oz-in2 Weight: 0.28kg Phrase: 2 Step angle: 1.8 degree Wiring: Black (A+); Green (A-); Red (B+); Blue (B-) Application: Stage lighting; engraving; textile machinery; equipment; placement machine; non-standard equipment; 3D printer; automation equipment colour:black Material:metal size:42x42x40mm Package Contents: 1* 42*42*34 stepper motor 1* Link line Warm Tips: Please note that this motor cannot be connected to the power supply directly. It should be connected to a constant current driver, otherwise, it will the motor. Please that the output current is not higher than the rated current of the motor (1.7A) or exceed the working voltage range of the motor (DC 9-42V). Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.