Note: The belt allows for these cars to run with more power, but not unlimited power.  They will not hold up to 4s modified.  2s is about the max you may want to go.  Carpet tires are formulated for carpet and will wear out quickly on asphalt.  You may also see tiny hairs from the belt in the sidewall.  While it would be ideal that they aren't there, they have no effect on the functionality or durability of the tire.