This kit is nice and small but great for showing things like bond angles, single/double/triple bonds and making some of the common small and large molecules. In a few minutes I collected Butane (C4H10), Nitrogen (N2), Oxygen (O2), Acetylene (C2H2), Hydrochloric Acid (HCl), Water (H20) and Chlorine Cl2). Connection details, although there isn't really much detail explaining the longer or shorter connection/binding length. Half of the instruction sheet was also in Chinese instead of two separate directions.