A resistor is an ubiquitous component in all electric devices and equipment. It reduces the current flow in a circuit; an essential function necessary to electronics. In the 1960's and earlier, the most common resistors were made of carbon and insulating powder, usually ceramic. These were called carbon composition resistors, and as carbon is a good conductor of electricity - the less carbon powder, the greater the resistance. The mixture of powders were held by resin and covered by paint or plastic, on which bands of colors indicated the resistance value. The carbon composition resistor, which was 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.