Specifications:Material: Steel(races), zirconia ceramic(balls)Inner Diameter: 8mm / 0.31Outer Diameter: 22mm / 0.86Thickness: 7mm / 0.27Quantity: 16pcsPackage Includes:16 x Bearings [ Design] With an 8mm inner diameter, 22mm outer diameter, and 7mm thickness, these 608 bearings are specifically designed to enhance speed for inline roller skates. [ Speed] The use of lighter ceramic balls allows the bearings to at a rate, requiring less energy to maintain their speed. [Improved Performance] Designed for inline roller skates, these bearings offer improved speed and performance for a smoother skating experience. [ Equipped with ceramic balls, these bearings are highly to and require minimal lubrication. [ Materials] These miniature bearings are crafted from premium steel and ceramic, ensuring low noise and a long lifespan. Brand Name Pissente Manufacturer Pissente Item Type Name Bearings Included Components No