The molecular model set is ideal for the use of studying simple organic and inorganic molecules. This molecular model set contains a variety of color plastic spheres to represent various atoms. The atoms have holes at specific angles to accept plastic rods representing covalent and ionic bonds. This ball-and-spoke molecular model set comes with 85 plastic spheres and 94 plastic connecting rods that include flexible double bonds. Balls are 23 mm in diameter except for hydrogen and chlorine atoms which are 17 mm spheres.