The film type resistor is composed of a resistive film deposited on, or inside of, an insulating cylinder or filament. Film type resistors have the best high frequency performance. The effective dc resistance for most resistance values remains fairly constant up to 100 MHz and decreases at higher frequencies. Film resistor types include: metal film, carbon film, cermet, metal-oxide and others. Film resistors are recommended where high stability and close tolerance resistance is required. Their resistance value can be accurately maintained over a broad range of temperatures and for long periods of time.