Small diameter ball bearings with a bearing outer diameter of less than 9 mm, a bearing inner diameter of less than 10 mm, and a bearing outer diameter of 9 mm or more.[Features]-Small diameter sizes are available.-Suitable for high-speed rotation.・ Open type, sealed ball bearings with grease (both seals or both shield bearings), and bearings with retaining rings are available.[Applications]-Can be used for parts that rotate at high speeds with low friction torque and for all applications that require low noise and low vibration.