Description Ideal for metal lovers collections to fill your collection. The surface is satin-finished, the effect is amazing, with metallic luster, and easy to maintain, suitable for collection, teaching, play. Due to the nature of metals, some oxidation or corrosion due to humidity and storage may occur. Features - Color: Assorted.- Material:Wood, aluminum, copper, iron.- Size: 8x6x3.5cm / 3.14x2.36x1.38inch.- Excellent for physics classrooms. Density Cubes 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.- It can also be used as a daily collection, as a decoration.Packing list: 1 x aluminum cube1 x copper cube1 x iron cube1 x woodden cube1 x packing box