RSD ceramic ball bearings specifically designed for front knuckles, pursuing high precision, light weight, and low resistance! The size is Φ10×Φ5×4.0mm, commonly used in front knuckles of various manufacturers. The internal dimensions have been thoroughly adjusted to minimize rotational resistance during driving. White ceramic balls, with the largest possible diameter, are highly wear-resistant and exhibit high durability. The reduction in rolling resistance due to the lightweight ceramic balls and the grease-free specification (no grease used) minimize rotational loss in the front axle, which is crucial for RWD drifting, and achieve smooth front tire rotation. Please try the RSD ceramic ball bearings that exhibit extreme rotational performance! ※Although the product is best used without grease, a thin layer of oil is applied to the surface of the product at the time of sale to prevent rust. We recommend removing the oil with a commercially available cleaner before installation. By removing the rubber protectors on both sides of the bearing, higher rotational efficiency can be achieved. When removing them, use a needle or other pointed object and be careful not to scratch the bearing itself. 【Caution】 Removing the protectors increases the chance of sand and dust entering the bearing. Perform regular maintenance to maintain performance. Also, when driving outdoors, we recommend using the protectors to prevent the entry of sand, etc.