Simplify the following text for a Grade 7 native English-speaking person.
Original: Metal film resistors are usually coated with nickel chromium ( NiCr ) , but might be coated with any of the cermet materials listed above for thin film resistors . Unlike thin film resistors , the material may be applied using different techniques than sputtering ( though that is one such technique ) .
Simplified: Resistors can be made out of many materials .