Motor type:2-phase 4-wire stepper motor Model Number:CNC Item Type:Mechanical Kit/Hardware Parts Material: Metal colour: silver + black Package Contents: 1 x 55mm Z axis sliding stroke kit 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.