1、These bearings are made of high quality steel for low noise and long service life. 2、They are double shielded to avoid contaminants entering and save lubricant. 3、There are several different types and sizes of bearing that you can choose as needed. 4、These are great for small hobby projects, suitable for both professionals and enthusiasts. 5、There comes total 10 pieces bearings which you may use for many different projects. Features: These bearings are made of high quality steel for low noise and long service life. They are double shielded to avoid contaminants entering and save lubricant. There are several different types and sizes of bearing that you can choose as needed. These are great for small hobby projects, suitable for both professionals and enthusiasts. There comes total 10 pieces bearings which you may use for many different projects. Specification: Model(Optional) Inner Diameter Outer Diameter Thickness 602-ZZ 2mm / 0.1in 7mm / 0.3in 3.5mm / 0.1in 603-ZZ 3mm / 0.1in 9mm / 0.4in 5mm / 0.2in Cage material: Steel plate Type: Deep-groove high-speed Usage: Universal Rolling Element: Single row steel balls Bearing Material: Bearing steel Angle: 15 degree Sealing: Double shielded Quantity: 10pcs Package list: 10 * Bearings