These durable are made of durable plastic case and copper connecting wire with strong conductivity, can be quickly and easily together to form either parallel or series connections. While this does teach students how electricity works, you must remind them not to play with actual electrical equipment around the house. Features - ColorBlack - Material: Plastic, copper. - Size: 7.50X3.50X0.90cm/2.95X1.38X0.35 inch. - This is great for home school making and breaking a circuit experiments. - Good for teaching basic principles of electricity and how a simple . - Easy to use and great learning tool for kids. Practicing on an education model would definitely good for any student. - Of course that while this does teach them how electricity works, you have to make sure to teach them not to play with actual electrical equipment around the house. - provides stability in handling and visualization of electrical principles, screw type binding post, screw down connection terminals are heavy duty. Package list: 10 x