A resistor is a ubiquitous component in all electric devices and equipment. It reduces the current flow in a circuit, an essential function necessary to electronics. In the 1960s and earlier, the most common resistors were made of carbon and insulating powder, usually ceramic. These were called carbon composition resistors and the less carbon powder that they contained, the greater the resistance as carbon is a good conductor of electricity. The mixture of powders were held by resin and covered by paint or plastic, on which bands of colors indicate the resistance value. The carbon composition resistor, which is used to craft this item, was often used in tube-based electronics such as radios, amplifiers, and television. It is seldom used in current electronics.