608 Full Ceramic Silicon Nitride Ball Bearing, the most common size in skate business is 608, the inner diameter is 8mm, outer diameter is 22mm and the width is 7mm, Bearing is made of Silicon Nitride Ceramic.

• Item: 608 Ball Bearing
• Type: Full Ceramic Ball Bearing
• Cage: No Cage
• Balls: Si3N4 Ceramic (Silicon Nitride)
• Inner/outer races: Si3N4 Ceramic (Silicon Nitride)
• Dimensions: 8mm x 22mm x 7mm/Metric
• ID (inner diameter)/Bore: 8mm
• OD (outer diameter): 22mm
• Width/Height/thickness: 7mm
• Size: 8 x 22 x 7 mm
• Quantity: One Bearing
• Non-Magnetic
• Non-Conductive