Features: <br>These miniature bearing are made of high quality steel and ceramic for low noise and long service life. <br>Bearing with ceramic balls is better resistant to corrosion and rarely require lubrication. <br>Bearing has a 8mm inner diameter, a 22mm outer diameter and a 7mm thickness. <br>These 608 bearing are specially designed for inline roller skate to improve speed. <br> <br>The lighter balls allow the bearing to spin faster, and uses less energy to maintain its speed. <br> <br> <br>Specifications: <br>Material: Steel(races), zirconia ceramic(balls) <br> <br>Inner Diameter: 8mm / 0.31" <br> <br>Outer Diameter: 22mm / 0.86" <br>Thickness: 7mm / 0.27" <br>Quantity: 16pcs <br> <br> <br> <br>Package Includes: <br>16 x Bearings<br>1、These miniature bearing are made of high quality steel and ceramic for low noise and long service life <br>2、Bearing with ceramic balls is better resistant to corrosion and rarely require lubrication <br>3、Bearing has a 8mm inner diameter, a 22mm outer diameter and a 7mm thickness <br>4、These 608 bearing are specially designed for inline roller skate to improve speed <br>5、The lighter balls allow the bearing to spin faster, and uses less energy to maintain its speed