Description: Featuring educational, this model toy can help children develop their interest in science and their intellectual ability, innovative thinking, hands-on ability. Multifunctional feature ensures it can cultivate children's thinking ability and hobbies. It can stimulate children's interest in learning and curiosity through DIY small production, and let children understand abstract knowledge through disassembly and assembly. Made of plastic material, it is eco-friendly and safe. The length of product is 7.8cm, the width is 11cm and the height is 11cm. Suitable for school, home, teaching accessories. Item Name: Trolley Material: Plastic Suitable Age: Over 5 Years Old Features: Safe, Reliable, Creative Size Details: 7.8cm x 11cm x 11cm/3.07" x 4.33" x 4.33" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Movement Principle: When an object ejects gas, liquid or solid, the ejected object will produce a thrust in the opposite direction. This thrust is called opposite force; the movement of the object under the action of force is called the opposite motion. Package Includes: 1 x Trolley