Flatface Dual Bearing Wheels are the fastest, smoothest, most durable wheels we have to offer. This is because instead of a single bearing, it features 2 bearings with a design almost identical to the way an actual skateboard wheel works. Because of the backless design, the only thing contacting the truck is the bearing itself, so they'll roll a lot better than any single bearing wheels possible. You'll have to try them yourself to see what kind of perfection is possible here at FlatFace. The G7.1s are also special in that they feature a different shape than you're used to seeing on Flatface wheels. The edges are rounded in a much different way, making them more like a "street" skate wheel in shape and a smaller riding surface.