The RSD ceramic ball bearings are made for the front knuckle with high precision, lightweight, and low resistance. The internal dimensions have been adjusted to minimize the rotation resistance while driving. White ceramic balls with the largest size of the ball as possible and are highly resistant to wear and durable. The lightweight ceramic ball reduces rolling resistance and greaseless specifications that have been discontinued by resisting greases. This minimizes the rotation loss of the front axle part which is considered important for RWD drifts, allowing for a smooth front tire rotation. Please try RSD ceramic ball bearings with extreme rotational performance. The product is greaseless, but at the time of sale, oil is applied to the surface of the product to prevent rust.