Unit Large Demonstration Set-Easily make models of hydrocarbons, alcohols, amines, organic and inorganic acids and bases, carbohydrates, benzene, chlorinated molecules, inorganic molecules and more that the whole class can see. Structures can be seen from the back of the class or lecture hall . Durable atoms and metal tubes ensure long-lasting models. Sturdy pegs join all atoms and bonds at any bond angle .Easy to handle, build and take apart. Bonds and atoms are to scale for accuracy at 8.5cm per 100pm . Full range of supplementary atoms, bonds and orbitals available