The Enduro Bearings 6904 LLB - Ceramic Hybrid offers a smart blend of chromium steel races from Enduro's ABEC 5 series and Grade 5 ceramic balls made of Silicon Nitride (Si3n4) from Zero Ceramic bearings. This mix results in a ceramic bearing that is lighter, more efficient, and cost-effective, making it ideal for hubs and bottom brackets. The low contact LLB seals ensure protection against water and dirt without adding friction or drag. Bearing Code: 6904 Dimensions: 20mm x 37mm x 9mm ABEC: 5 Grade: 5 Seals: LLB Grease: Kyodo Yushi PS-2 Application: Hubs, Bottom Brackets Weight: 31.13g Choose the Enduro Bearings 6904 LLB - Ceramic Hybrid for a reliable and efficient performance in your cycling components.