A MECHANIX Construction set for the budding engineer. Give this kit to the young child and see him get fascinated with the endless possibilities. Watch him just explore the possibilities and get his curiosity for this field struck. The Parts provided are of 100% safe plastic and no sharp edges, in other words it's child proof. Certain parts are designed to have an automatically lock the nuts thus making your child's first steps just that much easier. The easy to read step - by - step manual will guide him through these formative steps to graduate into more complex models.