Set of 8 skateboard bearings with the black Si3N4 silicon nitride ceramic balls, the set has 8 Ball Bearings with Ceramic Balls, Bearings are Rubber sealed, each bearing has 2 Rubber seals to protect the bearing from dust or any possible contamination, these are self lubricated bearings. Bearings have Si3N4 Silicon Nitride balls.

• Dimensions: 8*22*6 mm/Metric
• ID (inner diameter)/Bore=8mm
• OD (outer diameter)=22mm
• Width/Height/thickness=7mm
• Equal: 608-2RS1 & 608-2RZ
• Item: 608 Ball Bearings 8x22x7 608RS
• Type: Deep groove ball bearings 608RS
• Closures: Seals 608RS
• Quantity: Set of 8 Bearings
• Bearing Size: 8mm x 22mm x 7mm