SRAM 20mm Thru x 110mm Boost Bicycle Front Hubs
About SRAM - "Incremental enhancements. Perpetual improvements. Revolutionary Innovation. When advancements are continuously made to every attribute of every component, the result is overall performance that is simply second to none. And to real cycling enthusiasts, there is nothing more gratifying then achieving the ultimate ride. And the best part is we just keep making it better. This is what SRAM is all about."
This is hub spacing and is the width of the hub. It must match your fork specifications.