8PCS 608 Hybrid Black Ceramic Bearings 7 Beads ABEC-9 Bearing for Skateboard Longboard Inline Skate HandSpinner

BearingBearing Type:Hybrid ceramic bearingBeads: 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 steelCage :Nylon The material is suitable for high speed scene. Shield:two-sided dust coverSize: 8 * 22 * 7 (Inner * Outer * Height) / Unit: mmLimiting speed: 22 000 rev / minComparison of Tolerance Class: ABEC-9

• Bearing
• Product: Hybrid Black Ceramic Bearings
• 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.