“Hydrogen Pro wheels are made in the USA with the highest quality materials, standards and attention to details to be used during all race conditions and leisure skates for consistent, top-end performance on road, track, long distance and sprints. provides the extra speed required for athletic competitions. excellent, consistent performance, superior control in turns, great speed all track/speed competitions. They incorporate a multi-layer technology, Mtech®, which is comprised of two layers of urethane to provide the ultimate footprint (for grip), rebound (speed/energy return), roll and wear.” - Rollerblade