It is mainly made of metal material with multiple accessories for durability. The fruit battery science experiment kit is easy to operate. Following the detailed assembly instructions, all you need to do is prepare fruit or vegetables, such as potatoes. It generates electricity, allowing your child to visually see experiments come to life. Features - Color: As Shown. - Material: Metal. - Size: About 14.00X6.00X2.00cm/5.50X2.36X0.79in. - Made of metal material, safe and reusable, it is not easy to damage children due to leakage. - Complete the fruit battery science experiment project with the children to let the children experience the mysteries of science. - Cultivate children's imagination and hands-on ability, and make children more interested in physical science experiments. - By completing the fruit battery science experiment project with the children, enhancing mutual feelings and create good memories. - It can also improve children's hands-on ability, increase scientific knowledge, and cultivate a hobby of scientific invention. Package list: 2 Sets x Fruit Battery Project Kits