Each cube excellent for physics classrooms. Density teaching equipment have a wide range of educational applications for all grade levels, including density investigation, specific heat and specific gravity exploration. Due to the nature of metals, some oxidation or corrosion due to humidity and storage may occur. Simply scuff any oxidation off to make the item look again. Features - Color: Assorted color. - Material: Copper iron aluminum and wood. - Size:2.00 x 2.00 x 2.00cm/0.79 x 0.79 x 0.79 inch. - Set of 8 density cylinder. Set includes iron, copper, aluminum, wood. Includes a plastic snap case for convenient storage. - Excellent for physics classrooms. Density cylinder have a wide range of educational applications for all grade levels, including density investigation, specific heat and specific gravity exploration. - Due to the nature of metals, some oxidation or corrosion due to humidity and storage may occur. - Simply scuff any oxidation off to make cube look again. - Designed to be used in an educational setting and are not fabricated using ultra high precision machining. Package List2 x copper cubes 2 x iron cubes 2 x aluminum cubes 2 x wood cubes