The electric brushes we use for DC electricity transfer in electric plating equipment.The dimensions of the carbon brush are as follow:1. 7cm length2. 3.5cm depth3. 4cm height where there is a concavity to accommodate the rotating object to conduct electricity to(the concavity is to accommodate a copper cylindrical object with the diameter of 120mm, yet it is a part of this diameter)The wire is embedded in the brush and they are U shaped with the winded length of 10cm (total wire length is 20cm each and they are 2 wires)The material is to resist friction with copper object.Our order will be 100 pieces.Thank you