This set helps visualize the shapes of atomic and molecular orbitals. Contains enough individual parts to build 14 distinct models. 1s Unhybridized (1) 3d Unhybridized (5) 2s Unhybridized (1) 2s + 3 2 p orbitals Unhybridized (1) 2p Unhybridized (3) sp, sp2 sp3 Hybridized (3) Pink and purple coloured pear-shaped lobes represent the two wave phase (positive & negative) of the p and d atomic orbitals. White spheres represent the atomic nuclei. Each model comes with a transparent base for display. Comes complete with a sturdy plastic storage box and clearly illustrated instructions.