You might want to see other skateboard bearings.
The skateboards when befitted with ceramic skateboarding bearings should justify the following points:
Quality - should be appropriate and suitable to all skateboarders.
Lubrication - it's very important for the skater to maintain and take good care of his hard wares with fine multipurpose oil.
Rings:Chrome steel, stainless steel
Balls: Si3n4 Ceramic, ZRO2 Ceramic
Seal/Shield: Open or Both sides sealed
Class: Hybrid Ceramic
Logo: Can be made as customer's request
Packing: One tube of 8pcs
Tolerance Codes: ABEC-5, ABEC-7,ABEC-9