Silicon Nitride Materia Ceramic Bearing for Bikes 608z Bearing. Extended Service Life: Service life can be up to 10 times that of standard steel bearings. Electric Insulation: Prevents electrical arcing and acts as an excellent electric insulator. High Speed Capability: Hybrid design offers higher speed capability than all-steel bearings. Customized Grease Options: Available in SRL, Sb-M, Et-K, Super N, or fully customized grease. Low Maintenance Costs: Designed to reduce maintenance requirements and extend grease life. Vibration Resistance: Reduces wear caused by vibration and contamination effectively. Temperature Control: Operates at lower temperatures compared to traditional steel bearings. OEM and ODM Services: Full OEM and ODM services available for customized designs.