Advanced molecular model kit chemistry 178 Piece Complete Counted Dalton Labs Models make science come to life! Use atom pieces to practice structures, cyclic compounds, empirical formula, stereoisomerism, and VSEPR theory. Explore chemistry and physics concepts. Visualize atomic structure with atoms, bonds, orbitals, and links. Multiple piece sets utilize the ball and stick toys educational structure to teach students from grade 7 to the University Graduate Level. Demonstrate fundamental molecular geometry, chemical and biology structure, stereochemistry with 3D modelling studies. Dalton Labs is a USA family-owned business. Our products are made using only the highest quality materials. We always offer a 100% No Questions Asked, Refund Policy. Your satisfaction is our #1 priority.