Features 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 high‑quality material, it is durable, wear‑resistant and fall‑resistant, 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 Block Material: Copper + Iron + Aluminum + Wood Color: As shown in the picture Types: Copper, iron, aluminum, wood Product Size: Approx. 2x2x2cm / 0.8x0.8x0.8in Package List 1 x Copper Block 1 x Iron Block 1 x Aluminum Block 1 x Wood Block