The surface is treated with satin, the effect is amazing, with metallic luster, easy to maintain, suitable for collection, teaching and entertainment. for metal lovers to collect, to meet your collection needs. Due to the nature of the metal, some oxidation or corrosion may occur due to moisture and storage. Features - Color: Assorted. - Material: Wood, aluminum, copper, iron. - Size: 8x6x3.5cm / 3.14x2.36x1.38inch. - Very suitable for physics classrooms. The density cube has a wide range of educational applications in all grades, including density research, and specific gravity exploration. - Just wipe off any oxidation to make the cube look - Designed for use in an educational environment and does not use ultra-high precision manufacturing. - It can also be used as daily collection and adornment. - Due to the nature of the metal, some oxidation or corrosion may occur due to moisture and storage. Package list: 1 x aluminum x iron x woodden x packing box