It is a safe introductory kit Compatible with electricity teaching. It helps children to consolidate the knowledge in text books and gain a deeper understanding of the basics of current. By setting up simple circuits, it is easier Compatible with your child to learn basic electrical rules and improve your child's hands-on ability, thinking ability, creativity, and improvement.Features- Color: Black.- Material: Plastic, brass.- Size: 7.50X3.50X2.50cm/ 2.95X1.38X0.98inch.- Fine workmanship and creative appearance ensure its popularity and practicality.- Made of premium plastic and brass materials Compatible with durable and long lasting use.- Consist of plastic base, brass screw type bulb socket, red and black binding post.- Screw type binding post Compatible with removal an installation of connect wires quickly.- Very suitable Compatible with teaching the basic principles of electricity and the working principles of simple circuits.Packing list: 10 x lamp holders