Motor brushes are one of the most important components for electric motors. Replacing the brushes can fix an intermittent motor. Brushes can restore a motor's electric braking. The carbon brush is retractable. This is a high quality replacement brush for BF501 BF502 BF822 electric vacuum motor. Remember when installing them to make sure the carbon brushes go in completely and stay straight. It is normal to have to hold them in place until the connector is re-secured. Item: Motor Carbon Brush Color: Silver Material: Activated Carbon Size: 1 x 0.6 x 2.9 cm Package Contents: 12 x Carbon Brushes Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.