Fine workmanship and creative appearance ensure its popularity and practicality. This simple circuit kit bulb holder is simple to use and install, by setting up simple circuits, it is easier for your child to learn basic electrical rules and improve your child's hands-on ability. Features -Color:Blue. - Material:Plastic. - Size: About7.60X4.00X0.80cm/2.99X1.57X0.31in. -Very suitable for teaching the basic principles of electricity and the working principles of simple circuits. -High strength, good toughness, not easy to break, they are suitable for students' physics teaching. -The electrical circuit bulb holder is a great gift for students and children to learn electronic science. -Screw small bulb socket is great for electricity physics circuit, series parallel experiments, school teaching, classroom physics teaching. -With it, by building different kinds of model, improving their hands-on ability, creativity, thinking ability and awareness of electricity.