The XFX Flow series is unique in its construction and design features. To start, all of the XFX Series wheels are manufactured using flow-forming technology which makes for a stronger and lighter weight wheel than a traditional cast wheel. The XFX Series also has some awesome design features like the standard floating caps that come on every wheel. A unique feature of the XFX Series is that they are dual-drilled exposed lug wheels, which means that you can run spike lugs if that is something you want to do.