Description: _x000D_Miniature ball bearings are available ball bearings of quite small size. These miniature ball bearings have a 5mm inner diameter, a 8mm outer diameter, and a 2.5mm 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. _x000D__x000D__x000D_Features: _x000D_These miniature bearings are made of high quality bearing steel for low noise and long service life. _x000D_They are double shielded to avoid contaminants entering and save lubricant. _x000D_Bearings have a 5mm inner diameter, a 8mm outer diameter, and a 2.5mm thickness. _x000D_These are great for small hobby 5mm shaft/rod projects such as 3D printer, quadcopter or ship model._x000D__x000D_There comes total 10 pieces miniature bearings which you may use for many different projects. _x000D__x000D__x000D_Specifications: _x000D_Material: Bearing steel _x000D_Inner Diameter: 5mm / 0.19"_x000D__x000D_Outer Diameter: 8mm / 0.31" _x000D_Thickness: 2.5mm / 0.09" _x000D_Quantity: 10pcs _x000D__x000D__x000D_Package Includes: _x000D_10 x Bearings 1These miniature bearings are made of high quality bearing steel for low noise and long service life 2They are double shielded to avoid contaminants entering and save lubricant 3Bearings have a 5mm inner diameter, a 8mm outer diameter, and a 2.5mm thickness 4These are great for small hobby 5mm shaft/rod projects such as 3D printer, quadcopter or ship model 5There comes total 10 pieces miniature bearings which you may use for many different projects