Features 1、Metal Cylinders Set: You will receive 3 pieces of metal cylinders in total, including copper cylinder, iron cylinder and aluminium cylinder, meeting your basic needs. 2、Wide Application: These metal density blocks have a wide range of educational applications for all grade levels, including density investigation, specific heat and specific gravity exploration. 3、Transparent Storage Box: These density cylinders are all packed in the transparent plastic storage box, which ensures more convenience for storage and portability. 4、High Accuracy: This density block set is made by hand, which features high accuracy in size, excellent for physics classrooms and laboratory experiment. 5、Warm Tips: Due to the features of metals, some oxidation due to humidity and storage may occur. Simply scuff any oxidation off to make the item look brand new again. Specification Item Type: Metal Density Blocks Material: Copper, Iron, Aluminium Product Use: Laboratory, School, Testing Institution Package List 3 x Metal Density Blocks 1 x Storage Box