This is a plastic molecular model for learning about various molecular structures. Please note that it is homemade using a 3D printer. The following parts are included: * Carbon (Black, 4 holes) x 15 * Hydrogen (White, 1 hole) x 30 * Oxygen (Red, 2 holes) x 10 * Nitrogen (Blue, 3 holes) x 5 * Phosphorus (Purple, 5 holes) x 5 * Spare atoms (White, 4 holes) x 10 * Short connectors (White) x 40 * Middle connectors (White) x 40 * Long connectors (Flexible, White) x 20 * Remover (White) x 1 ※ Please read the included instruction manual carefully before use.