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powerblading is new to agressiverollerblading instead of having grind spots, and tiny wheels they put 4 large rubbery wheels that can go much faster, are easier to use on rougher surfaces and absorb much more vibrations. its pretty much the arials of rollerblading, i think it looks pretty sweet anyways heres some vids and anyone who knows anything about this +k for any size 8, 8 1/2 setups you can find under 300$