anything traxxas. i can run them now because i think ive moved past that, but the e-z star is a blessing for begining. make sure they have a place to run though. the back yard wont cut it unless its 50 ft by 75 ft and flat with now grass. lol. if theres no track, try a monster truck. little bigger, little easier to maintain. dont brake as much. heres an i dea dad, get one too. its more fun than you think and it will give you and your boys a chance to work together. just some advice. good luck and tell them to stay off the walls.