Miniature ball bearings are small-sized bearings with a 3mm inner diameter, 6mm outer diameter, and 2.5mm thickness. These precision bearings are suitable for applications requiring compact mechanical components, such as 3D printers, quadcopters, and models. Features: - Made from high-quality bearing steel for smooth operation and durability - Double-shielded design helps protect against contaminants and retain lubrication - Ideal for use with 3mm shafts in small-scale hobby projects - Suitable for various applications including 3D printers, quadcopters, and model building Set includes 10 miniature ball bearings for multiple project uses. Specifications: - Material: Bearing steel - Inner Diameter: 3mm (0.12") - Outer Diameter: 6mm (0.23") - Thickness: 2.5mm (0.09") - Quantity: 10 pieces Package Includes: 10 x Miniature Ball Bearings