Ten Specimen Density Set (Ten piece/cube/block) 1" Cubes include: Acrylic, Aluminum, Brass, Copper, Iron, Nylon, Maple, Pine, Poplar, and PVC. Comes with instruction manual and companion webpage to help understand Archimedes' Principle Cubes are embossed or printed with the material for easy identification Comes in a 5.5" x 4.5" x 1" storage box Perfect kit for classrooms or inquisitive kids at home!