Features 1、The kit is convenient to build methane (CHA), ethane (H3C-CH3), ethylene (H2C=CH2), acetylene (HCECH), ethanol (C2H5OH), acetaldehyde (CH3CHO), acetic acid (CH3COOH), benzene (C6H6), Molecular structure model of most organic compounds such as ethyl bromi 2、Identify concepts such as stereoisomerism and conformational analysis and help you learn and understand the physical and chemical properties of the compounds involved. 3、This device is ideal for families with family education. 4、These parts fit snugly but are not tight and will not separate. 5、They are shiny and heavy, providing a good visual effect for the elegance of molecular theory. Specification Features: The kit is convenient to build methane (CHA), ethane (H3C-CH3), ethylene (H2C=CH2), acetylene (HCECH), ethanol (C2H5OH), acetaldehyde (CH3CHO), acetic acid (CH3COOH), benzene (C6H6), Molecular structure model of most organic compounds such as ethyl bromide (CH3-CH2Br), alcohols, aldehydes, acids, ketones, carboxylic acids, esters, ethers, amines, halogen compounds. Identify concepts such as stereoisomerism and conformational analysis and help you learn and understand the physical and chemical properties of the compounds involved. This device is ideal for families with family education. These parts fit snugly but are not tight and will not separate. They are shiny and heavy, providing a good visual effect for the elegance of molecular theory. Specification: Item Type:Molecular Model Kit Hydrogen Atoms Diameter: 17mm / 0.67in Other Atoms Diameter: 23mm / 0.91in Package List: 80 x Atoms 60 x Links Package List