When static electricity buildup needs to be discharged, a Black Wheel for MINIRAIL is used. In Electronics, it can be used to avoid situations such as static electricity buildup during microchip and electronic circuit board manipulation. The use varies as different technical characteristics come into play. With respect to Electricity, it can be used to avoid sparks created by static electricity during transportation. Sometimes in the case of plastic products accumulation of static electricity causes components to stick together; in such cases the black wheel minirail totally discharges the electricity buildup. It is made of conductive plastic material and it has pre-assembled wheels using steel axles.