1、MAIN PURPOSE: Chemistry molecular model kit, used to build CO2 crystal structure model in the form of elemental substances in textbooks. 2、ATOM SPECIFICATION: Including 28 sky blue oxygen atoms and 14 black carbon atoms, with standard holes and sizes, making it easier to use and learn. 3、BOND SPECIFICATION: Includes 3 specifications of single bond metal rods for connecting oxygen atoms and carbon atoms, easy to install and remove. 4、PLASTIC MATERIAL: These atom models are made of excellent plastic, with good durability and texture, high gloss, bending resistance, and long service life. 5、APPLICABLE SCENES: The crystal structure model kit can be used as a popular science aid, chemistry classroom teaching, to stimulate research and learning interest.