Featuresdiameter 53mmunmatched flatspot resistanceformulated for a harder faster ridemore speed and controlsmooth anti stick slidematerialsdurometer 99a polyurethanerelight your fire with the formula four afterburners from spitfire fully fueled with a sizzling colourscheme and fiery design these wheels are sure to rekindle your passion for skating blaze your own trail with these red hot rollers that show no signs of burning out