Includes 62 White Hydrogen balls, 31 Red Oxygen balls, 44 Gray links, 62 White links Elements identified by color Hands on model, assembly required A clean and effective tool for teachers, or a project and study-aid for students The 199 piece Water Molecular Lattice Model Kit provides a tangible and hands-on display of the molecular properties of water (H2O). A clean and effective tool for teachers, or a project and study-aid for students, the model requires assembly and attrition that will reinforce the study of water. âšWARNING: Choking Hazard - Small parts. Not for children under 3 years.