This zinc and copper sheets can be used for studying, teaching, learning, presentation, etc. Creative present for students to learn How to use fruits and to generate electricity. Intuitive experiment with interesting material help to stir students' interest in studying the physics and chemistry. Features -Color:Assorted Color -Material:Copper, Zinc -Size(zinc strip):4.00X0.90X0.08cm/1.57X0.35X0.03in -Size(copper strip):4.00X0.90X0.22cm/1.57X0.35X0.09in -Teaching use: These metal strips can be used to build diy fruit batteries, great for teaching, learning, presentations, and more -Great tool: The metal strip set is a great tool to help motivate students to learn about physics and chemistry -Science learning: Parents can carry out interesting fruit battery science experiments with their children. Cultivate students interest in science learning -Easy to use: Simple and easy to use, improve the fun of the classroom, students' practical ability, and stimulate students' interest in learning -Good craftsmanship: Made of copper and zinc material, craftsmanship makes them not easy to bend or break Package list: 20 x Copper Sheets 20 x Zinc Sheets