Feature(may vary by option.)

●Bearings
●Specification: 608Z (single face metal seal); Size: 8*22*7mm
●Bearing material: Silicon nitride black ceramic ball + Boiled black special grade steel inner and outer ring
●Bearing accuracy: ABEC-11; Ball size: 3.969mm
●Number of balls: 6 silicon nitride black ceramic balls

[16pcs Si3n4 Ball 608z]

Description

Bearings
Features:
1. Black Ceramic ball Skates Bearings 608.
2. Precise and High Speed 6 balls innovative design, faster and more stable.
3. Anti-rust ,self-lubricated si3n4 black ceramic balls.
4. Excellent for professional speed Skating ,inline skates competition.
5. Amazing fast and stable! Born for competition!
6. High precision Si3n4 ceramic balls can bear higher temperature, when the bearing is under very fast speed rotation,the balls wont expand.
So that it can help to ensure a faster speed and longer life of the bearing.