Various shapes are used to teach students how to make measurements in the Metric System and how to use the formula: Density = Mass/Volume, Students use the various materials to demonstrate densities, Includes one aluminum bar 3"" x 1"" x 1/4"" two 1/2"" aluminum cubes one steel sphere one glass sphere and one 15 cm scale, American Educational Products have a lead ship time of 21 days, SKU: AMED661