Features: _x000D_ These bearings are made of high quality steel for low noise and long service life. _x000D_ They are double shielded to avoid contaminants entering and save lubricant. _x000D_ There are several different types and sizes of bearing that you can choose as needed. _x000D_ These are great for small hobby projects, suitable for both professionals and enthusiasts._x000D_ _x000D_ There comes total 10 pieces bearings which you may use for many different projects. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Model(Optional) Inner Diameter Outer Diameter Thickness _x000D_ 604-ZZ 4mm / 0.2in 12mm / 0.5in 4mm / 0.2in _x000D_ 605-ZZ 5mm / 0.2in 14mm / 0.6in 5mm / 0.2in _x000D_ 606-ZZ 6mm / 0.2in 17mm / 0.7in 6mm / 0.2in _x000D_ _x000D_ Cage material: Steel plate _x000D_ Type: Deep-groove high-speed _x000D_ Usage: Universal _x000D_ Rolling Element: Single row steel balls _x000D_ Bearing Material: Bearing steel _x000D_ Angle: 15 degree _x000D_ Sealing: Double shielded _x000D_ Quantity: 10pcs _x000D_ _x000D_ _x000D_ Package list: _x000D_ 10 * Bearings