608 Full Ceramic Skate ball bearing that has zirconia rings ZrO2 and silicon nitride Si3N4, works in all skate applications like skateboard, inline skate, rollerblades, roller hockey, and even the 8mm quad rollers. These bearings can be used in the inline skate, rollerblade and roller hockey. These bearings are to be used for races and competitions, you will need 8 bearings for skateboards and 16 for all other skate applications.

• Item: 608 skate bearings
• Type: Full Ceramic
• Bearing Size: 8mm x 22mm x 7mm
• Dimensions: 8*22*7 mm/Metric
• ID (inner diameter)/Bore=8mm
• OD (outer diameter)=22mm
• Width/Height/thickness=7mm
• Inner/outer races: ZrO2 (zirconium oxide) Ceramic
• Balls: Si3n4 (silicon nitride) Ceramic
• Quantity: One ball bearing
• Cage: PTFE
• Closures: Open