Features High Quality Material--- Made of high quality bearing steel, these miniature ball bearings ensure low noise and long service life. Double Shielded Design--- The double shielded design prevents contaminants from entering and helps save lubricant, ensuring optimal performance. Precise Dimensions--- With a 3mm inner diameter, 8mm outer diameter, and 4mm thickness, these bearings are ideal for small hobby projects like 3D printers and quadcopters. Versatile Usage--- These miniature bearings can be used in various projects, providing reliable performance for applications that require small mechanical parts. Value Pack--- Each set includes 10pcs of miniature bearings, offering great value for money and convenience for multiple projects. Description:Miniature ball bearings are available ball bearings of quite small size. These miniature ball bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness. Ball bearings of this size are ideal for precision work and applications that require a lot of functional mechanical parts in a small space, such as 3D printer, quadcopter or model. Features:These miniature bearings are made of high quality bearing steel for low noise and long service life.They are double shielded to avoid contaminants entering and save lubricant.Bearings have a 3mm inner diameter, a 8mm outer diameter, and a 4mm thickness.These are great for small hobby 3mm shaft/rod projects such as 3D printer, quadcopter or ship model. There comes total 10 pieces miniature bearings which you may use for many different projects. Specifications:Material: Bearing steelInner Diameter: 3mm / 0.12" Outer Diameter: 8mm / 0.31"Thickness: 4mm / 0.15"Quantity: 10pcs Package Includes:10 x Bearings Package List