ball bearing
Bearings
Features:
1. Precise and High Speed 7 beads design,more stalbe and stronger supporting ability
2. Double side more Dust-proof
3. Excellent for professional speed Skating competition!
4. Self-lubricate si3n4 ceramic beads, longer life.
Fit for: Inline roller skates, speed skating competition, double rocker, longboard, skateboard , drift board, fidget spinner,single roller skates, 3d printer.