Carbon brush is motor or generator, or other rotating machinery fixing part, and the rotating part of pass energy or signals device. Carbon brush is the transfer of energy or signals between the fixed portion and the rotating part of the motor or generator or other rotating machinery equipment. It is generally made of pure carbon plus coagulant, appearance generally was square , stuck in the metal stent, which has a spring pressed it on the shaft. Worn brushes are often the cause of a poorly running motor. Carbon motor brushes are one of the most commonly replaced power tool components. Replacing brushes can fix an intermittent motor. Carbon Brushes with wire leads and brush springs attached. New brushes can restore a motor's electric braking. Specifications: Material: copper Carbon brush Size: 32x11x6mm Color: Black Quantity: 6Pcs Package Included: 6 x Motor Carbon Brush Note: Light shooting 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.