Features: brand new and high quality Assembly STEM Engine Model Toy: The STEM engine model toy have a detailed DIY accessories, fun assembly with awesome stimulation of kids' interest, learn and understand the principles of mechanical transmission, well exercise children's hands-on ability, encourage and enhance brain development, improve their hand & eye coordination as well. Parent-Children Interactive Toy: A perfect interactive toy for parents & children DIY together, through the building process to let kids well know the basic science knowledge, the toy kits contains small accessories and for sharp objects, children must be accompanied by an adult, please take care of children to avoid swallowing. DIY Science Experiment Toy: The science toy kits require great patience, kids need to concentrate to the DIY science toy, through playing to improve their building skills, exercise kids' concentration and with good stimulation to educational training for them. Qualification Material: Made by quality zinc alloy, well polished as well as wear-resistant, non-toxic and safe friendly to your kids, durable and stable to ensure the playing experience. for Ideal Gift for Kids: Suitable for kids as birthday gifts, Christmas gifts, and follow the instructions to finish and DIY the science project,let them understand basic mechanical knowledge. Package Includes: 1 x DIY Engine Model Toy Specifications: Product Dimension: approx. 16.5 x 8.7 x 9.5cm/6.49 x 3.42 x 3.74 inch Material: Zinc Alloy Net Weight: approx. 480g/1.05 lbs Suitable Age: Age over 6 years old note: Please allow 1-2cm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item.