Kyosho Inferno MP9 black slotted wheels come in a full set of 4. Now made in a larger diameter to eliminate some sidewall flex on your tires the new wheels are made of a harder plastic than the older MP777 versions. Less flex and stronger overall Make an improvement that is felt immediately at the track in increased steering response. The slotted design help dirt and debris from building up in the rim as well as giving you visual clues to wheel spin while driving on the track. The theme that is popping up more and more here is that every part of the new Inferno MP9 has been improved in dramatic ways!