This big MECHANIX set has instructions to build 21 models with more than 200 pieces. The best part about it is that it starts with simple models that gradually increase in complexity as the skill of the builder grows. This along with the number of versatile parts (including gears) makes it a great set for beginners and advanced builders alike. This modern MECHANIX set is the perfect introduction of engineering to children. The models and parts are designed to making the building process easy and a great way to encourage a child into the new experience of creation. The manual starts with basic models first and as the skill of the builder increases, complexity of models also increases, which make it perfect for the first time builder.