This 6-piece equal mass metal cylinder set includes copper, lead, brass, zinc, iron, and aluminum cylinders. Each cylinder has the same 100g mass and 0.6" (16mm) diameter, but they vary in length from 2" to 7.5" due to their different densities. Each cylinder features a drilled hole at one end for suspension. The equal-mass, equal-diameter design isolates material density as the variable, allowing students to observe how the same mass occupies different volumes depending on the material. A wooden storage block is included. The set is designed for specific heat, specific gravity, and density experimentation. Part of the Eisco Labs Density Investigation series.