The zinc and copper strips are made from zinc, copper materials that are safe and excellent. This makes it perfect for children to use without worries. Can be used to conduct fruit battery experiment, making it great educational tool for teachers. The simple design of the strips makes it easy for children to assemble and use, which encourages them to about science. Features -Color:Assorted Color -Material:Zinc, copper -Size:4.00X1.00X0.10cm/1.57X0.39X0.04in -This strips is designed to be easy for children to assemble and use, making it great way to encourage them to about science. -Can be used for fruit battery experiment, provides fun and convenient way for children to learn about electricity. -With small and compact size, portable and lightweight, copper and zinc strips are convenient and useful. -Made from zinc, copper materials, this metal strips is safe and excellent, sturdy and useful. -Wonderful workmanship, simple structure, reasonable design, strips are convenient and useful, easily bring fun. Package list: 10 x strips 10 x zinc strips