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 PackageList:3 x Metal Density Blocks 1 x Storage Box