The Enduro Bearings MR 17287 LLB - Ceramic Hybrid offers a smart blend of chromium steel races from Enduro's ABEC 5 range and Grade 5 ceramic balls made of Silicon Nitride (Si3n4). This mix results in a ceramic bearing that is lighter, more efficient, and cost-effective. It's ideal for use in hubs or bottom brackets. The low contact LLB seals keep out water and dirt without adding friction. Bearing Code: MR 17287 Dimensions: 17 x 28 x 7mm ABEC: 5 Grade: 5 Seals: LLB Grease: Kyodo Yushi PS-2 Application: Hubs, Bottom Brackets Weight: 13.00g The Enduro Bearings MR 17287 LLB - Ceramic Hybrid is designed to enhance your cycling experience by providing smooth and reliable performance. Its construction ensures durability and efficiency, making it a great choice for serious cyclists.