As above, yellows waaaaay to soft so avoid like plague unless you like grip rolling at every corner
. I had blue mini pins on mine and it was stil a right b*****d until I dremelled off the 3 outer rows on the fronts and the rest of the pins had worn down a bit. That being said, I couldn't get Kourse Kings to work on my Blitz on carpet, it had no steering at all with them.