This premium SMR84-2RS-CB ball bearing combines advanced materials and precision engineering for exceptional performance. Featuring hybrid construction with Si3N4 ceramic balls and stainless steel races, this 4x8x3mm bearing delivers superior speed capabilities while minimizing friction and heat generation. The ABEC-7 precision rating ensures consistently smooth and quiet operation, while the stainless steel components provide excellent resistance to rust and corrosion. Designed for high-speed applications, this bearing operates without conventional grease lubrication, preventing unwanted buildup that could impede rotation. The ceramic ball design offers reduced friction and improved durability compared to traditional all-steel bearings. Perfect for applications requiring precise, high-speed rotation and reliable long-term performance. The compact dimensions and robust construction make it ideal for specialized mechanical applications where standard bearings won't suffice.