kit is made of , sturdy for use. Easy to use, follow the detailed assembly instructions, DIY design, which will produce electricity, it can arouse students' interest to learn, and achieve good educational effect. Features -Color:Assorted Color -Material:Plastic, glass, iron, copper -Size:9.00X3.00X3.00cm/3.54X1.18X1.18in -Size:18.00X0.50X0.50cm/7.07X0.20X0.20in -Voltage of the bulb:2.5v. -Power supply:2 x AA batteries(not included) - By completing the tiny circuit science experiment project with your child, let your child experience the science. - Used in electrical experiments in primary and middle schools or DIY circuit , arouse students' interest - Develop your child's imagination and hands-on ability, this science toy makes your child more interested in scientific experiments - This educational toy emphasizes fun, exploration, and discovery, can be good gift choice to your kids - Made of , the circuits for kids can train your children's observation capability, scientific knowledge skills Package list: 2 x battery boxes(battery excluded) 3 x wires 1 x bulb 1 x 1 x lamp holder