Help students understand the shapes of crystalline solids using models of the 3 cubic unit cells: cubic, body-centered cubic, and face-centered cubic. These models help students understand how to solve problems based on unit-cell properties, such as calculating atomic mass, density, and Avogadro's number, that routinely appear in textbooks and on standard examinations. Cubic and body-centered cubic models measure about 3" sq; face-centered cubic model measures about 3 1/2" sq. Order individually or as a set.