Mechanix Advance Smart Bag is an engineering set that keeps children actively engaged and also stimulates their overall development. This metal building toy set comes with 249 pieces of reusable parts that need to be assembled to make 28 working models. All the pieces included in this game have been made from high-quality steel that bestows them with an amazing hardiness, enabling them to retain their effectiveness for years. At the same time, these parts are non-toxic, so they are completely safe for kids to play with.Teaches about art of designing and construction. Helps creating various models with your own imagination. Learns basics techniques of constructing mechanix instrument/tools.How to play: Step by Step fix the spare parts with help of bolts and nuts. To fit the bolts tightly, make use of spanner holding the nuts , given inside the box. Assemble accordingly the whole process to make your Mechanix Advance fly, run, lift and swing