Ideal for advanced level courses Create three dimensional simple or complex molecular structures or organic or inorganic compounds, with universal color code for atoms. Components stored in a sturdy four compartment plastic case. Ideally suited for advance level courses. The set can be used for modeling three dimensional simple or complex molecular structures or organic or inorganic compounds, with universal color code for atoms. The set contains the following: Elements: Black Balls - Carbon, count of 12 Yellow Balls ? Sulfur, count of 4 Yellow Balls ? Chromium, count of 6 White Balls with connector ? Hydrogen, count of 26 Orange Balls ? Sodium, count of 4 Orange Balls ? Calcium, count of 6 Green Balls ? Chlorine, count of 5 Blue Balls ? Phosphorus, count of 6 Red Balls ? Oxygen, count of 6 Connectors: 25mm ? count of 20 33mm ? count of 15 48mm ? count of 2