It is a kind of miniature light base holder, which is mainly used in electrical experiments in primary and secondary schools. This product is made of copper material, sturdy and durable. It is necessary electrical equipment for primary school science, middle school physics laboratory and student home laboratory. Features -Color:Golden.-Material: Copper.-Size: About1.90X1.20X1.00cm/0.75X0.47X0.39in.- This miniature light base is mainly used in primary and secondary school electrical experiments.-Made of copper materials for durable and long lasting use.-Great instrument for learning physical and electrical experiments, allowing you simple to operate.-Enough quantity can meet your daily using needs and can share with friends.-Can be used in physical teaching science experiment equipment, home experiment circuit electrical test, etc.Packing list: 25 x E10 Lamp Bases