BUILD YOUR OWN ENGINE KIT – The Build Your Own Model Engine Kits from Machine Works make excellent gifts for vehicle and model enthusiasts who like creating and learning about mechanical systems and engineering. Requires 3 x AA batteries (not included) DIY KITS FOR ADULTS AND KIDS – This functional model of a Turbofan Jet Engine is the perfect activity for both children (over 10 years) and adults to build together DISCOVER & LEARN AS YOU BUILD – This model is a simplified Replica of a Jet Engine and illustrates the main operating principles and functions. It also plays recordings of real Jet Engine Sound INCLUDES OVER 40 PARTS – This 40+ piece kit for kids and adults is enjoyable to construct and includes all of the tools you'll need to complete the operating model. The Fully illustrated step-by-step instructions guide you through every stage of the assembly process. The model engine includes independent low and high pressure turbine spools & a see-through casing to observe the engine's moving parts STEM LEARNING - All Machine Works products are designed to illustrate how internal engines work, Manufacturer: Trends UK Ltd