Features: brand new and high quality Assembly STEM Toy: The STEM toy have a detailed DIY accessories kits, 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 Marble Run 3D Puzzle: This 3D wooden marble run kits is powered by battery, gear rotation, with whole mechanism design inside that ensure you to feel the charms of machinery, the science toy kits require great patience, kids need to concentrate to the DIY science toy, through playing with good stimulation to educational training. Qualification Material: Made by quality wood material and electronic components, smooth edges as well as wear-resistant, non-toxic and safe friendly to your kids, pre-cutting pieces 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. Specifications: Product Dimension: approx. 23.5 x 17 x 5cm/9.25 x 6.69 x 1.97 inch Material: Wood, Electronic components Style Option: A/B Net Weight: approx. 400g/0.88 lbs Package Includes: 1 Set Electric Marble Run DIY Kits 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.