The Robotix-2 set is a special set, that teaches a child about continuous track propulsion, friction, gears, motions and many other STEM concepts. While he builds any of the models in the set, there is magic that happens in his/her mind. You will notice their concentration while they are trying to follow the instructions and build something, or problem solving when he/she reaches a roadblock and finally the special feeling of delayed gratification when they finally finish their masterpiece. A feeling and experience every child must be privilege to.