Note: Different parameters' motors have their different looks. The lower speed and higher voltage are, the larger the torque is. Please read the parameters table before buying. Thanks!!! Voltage: DC6V, DC12V, DC24V; No-Load Speed: 6rpm, 10rpm, 18rpm, 23rpm, 30rpm, 40rpm, 90rpm, 150rpm; Error: ±10%; Output Shaft Diameter: 6mm D-type; Output