Durable: Made of copper material, high safety factor, durable. Single single throw switch for making and breaking a single electrical connection circuit. Easy to use: Stability, visualization of electrical principle, screw terminal, convenient wiring, safe electrical connection. Low voltage: Max working voltage 36V. Low voltage, low current switch for low voltage DC power supply. Knife switches stability processing and visualization of electrical principles. Experimental use: Suitable for schools to conduct on-off experiments of single electrical connection circuits, providing students with learning electrical and circuit principles. This is for laboratory use and cannot be connected to home. Material:copper colour:black Contents: 10 * Single Single Throw Knife Switch Only the above content, other are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.