Use for Inline Roller Skates Shoes Speed Inline Roller Skating FreeLine Skate (Drift Board) Skate board LongBoard Scooter.
Notice:
The Ceramic Bearings donot need to use Lubricants.
It has special rustle sounds if you want them be quiet you can use some liquid lubricating oil but it will impact the speed.
Description
bearing
Bearing Type:Hybrid ceramic bearing
Beads: 7 Black Ceramic Beads (Si3N4)
Rolling elements:7 Blackceramic Beads High Temperature and Abrasion resistance High Revs.
Black Ceramic has better hardness and compressive strength than white Ceramic that is why it expansive than White Ceramic Bearings.
bearing ring:High Quality bearing steel
Cage :Nylon The material is suitable for high speed scene.
Shield:two-sided dust cover
Size: 8 * 22 * 7 (Inner * Outer * Height) / Unit: mm
Limiting speed: 22 000 rev / min
Comparison of Tolerance Class: ABEC-9