This is a ceramic capacitor with the part number CAP CER 39PF 1KV NP0 1812. It has a capacitance value of 39 picofarads and a tolerance of ±10 percent. The operating voltage rating is 1000 volts, making it suitable for high-voltage applications. This component uses the C0G (NP0) dielectric material and has a metric size designation of 1812 or 4532 in imperial measurements.