Zipp Speed Weaponry Cartridge Bearings Features: Measurable wattage savings between 1.5 and 9 watts per bearing set, depending on the level and condition of your existing bearings One kit required for: Zipp Super-9, 900 tubular and Sub-9 disc rear hubs Includes bearings and one grease syringe Note: 88 front and 188v9 rear hubs are on all 2014 and newer Zipp 202, 303, 404, 808 Specs: Manufacturer Number61803 MaterialCeramic