Feature:1. It is used to measure the density of an object and, on the premise of knowing the density of a certain object, measure the volume of the object to calculate the mass of the object.2. Made of highquality material, it is durable, wearresistant and fallresistant, and can be used for a long time.3. It is suitable for copper, iron, aluminum, wood, mechanical and physical experiments with the same volume and different mass density.4. These cubes group can effectively help students understand the law of calculation of object mass and promote the development of students'practical ability.5. Very simple and practical, simple operation, it has exquisite workmanship and excellent quality. It can be used as laboratory auxiliary tools.Specification:Item Type: Cubic BlockMaterial: Copper + Iron + Aluminum + WoodColor: As shown in the pictureTypes: Copper, iron, aluminum, woodProduct Size: Approx. 2x2x2cm / 0.8x0.8x0.8in .Package List:1 x Copper Block1 x Iron Block1 x Aluminum Block1 x Wood BlockNote:1. Please allow 1‑2in error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.