black ceramic bearing for inline speed skates patines 7 balls oxide speed bearing for powerslide for cityrun race skate shoes

the black ceramic bearing is designed for professional speed competition;

7 Si3N4 ceramic balls brings stable structure;

strengthen cage never get cracked;

black oxide surface is cool and never get rusted;

dual dustproof covers can avoid dust;

self-lubricated features,don't need oil;

the price is for 16 pieces bearings.

Package included:

16 pieces bearings with iron container