A member of the original 5 MECHANIX set is still one of the best selling MECHANIX set sold today. The building experience is enhanced with the real engineering tools that you can use to create the 15 models mentioned in the set before exploring the endless creativity this set allows. With this MECHANIX 2 set, you can build many models mentioned in the manual and then with additional parts like the RT-55, it can help expand the possibilities of bringing your imagination to life.