Welcome to our store! Organic/inorganic chemistry tutorial, ball-and-stick type, proportional molecular structure model. This model set can be used to construct a variety of common and slightly complex C, H, O, N, Br, I chemical organic molecular structure models, suitable for teaching and laboratory use. It can also be used to construct structural formulas for various molecules of inorganic and organic substances in chemistry textbooks. The model is made of environmentally friendly plastic, ensuring safety and durability. It is not easy to break and has a long service life. In addition, this model can increase students' interest in learning and facilitate more intuitive explanations from teachers. It is very convenient to use. Specification: Material: Plastic H Atom Diameter: 17 mm Other Atom Diameter: 23 mm Package List: - 86 Atom Models - 153 Links - 1 Link Tool - 1 Plastic Box 100% Satisfaction: Our customers are our top priority. If you find any product problems after receiving the goods, such as damage and incorrect quantity of goods, please contact the seller immediately. We will do our best to provide you with satisfactory customer service.