Feature: 1. Easy to assemble and operate, inspire children\u0027s interest and curiosity. 2. Stimulating students\u0027 creative thinking and ability by learning physics. 3. Help teacher to make the science class more lively and interesting. 4. Small experiments can also consolidate students\u0027 mastery of physical knowledge. 5. Great playing model tools, children can DIY colors on. Specification: This small science experiment model, about a physics principle, is made by good quality wood and other assembled parts for primary and middle school students or teachers to make the science class more vivid and improving students' experimental operational skills. Features: Easy to assemble and operate, inspire children's interest and curiosity. Stimulating students' creative thinking and ability by learning physics. Help teacher to make the science class more lively and interesting. Small experiments can also consolidate students' mastery of physical knowledge. Great playing model tools, children can DIY colors on. Specifications: Material: wood Suitable Age: 10+ Knowledge Point: worm drive Power: 2 * AA batteries (not included) Item Size: 95 * 70 * 265mm / 3.74 * 2.76 * 10.43in Package Weight: 149g / 5.26ounce Package Size: 200 * 285 * 30mm / 7.87 * 11.22 * 1.18in Note: Please allow 1-10mm error due to manual measurement, thanks for your understanding! Battery is needed but not included in package, you need to prepare yourself! Package List: 1 * Science Model Kit Package List: 1 * Science Model Kit