Polyester film capacitors are film capacitors using a dielectric made of the thermoplastic polar polymer material polyethylene terephthalate (PET). It is manufactured both as metalized wounds and stacked versions. They are the low-cost mass-produced capacitors in modern electronics, featuring relatively small dimensions with relatively high capacitance values. PET capacitors are mainly used as general-purpose capacitors for DC applications, or for semi-critical circuits with operating temperatures up to 125 C. It features instability, low inductance, and low cost.