Rollerblade New 2015 Tempest 100C Premium Fitness Skate with 4x100mm US Made Hydrogen Wheels - SG9 Bearings Stable and precise carbon shell provides incredible support and long distance performance US Made Hydrogen 4x100 wheels are amazing with speed 325mm lo-balance extruded aluminum frames and SG9 high performance bearings brake in box Rollerblade created the modern sport of inline skating back in 1980 and continues to lead the category in quality innovation sales and development Rollerblade high performance skates provide quality construction to meet and exceed expectations liners will pack out fit should be snug when new Tempest skates are designed for the serious fitness skater featuring mid-high anatomical molded boots and our best wheels and bearings