This is a high-quality ceramic capacitor with the following specifications: CAP CER 82PF 4KV C0G/NP0 1825 - an 82 picofarad ±5% capacitance value and a 4000V (4kV) voltage rating. It has a C0G or NP0 dielectric, making it suitable for applications requiring stability in temperature. The capacitor is available with the metric size designation of 4564 and corresponds to the standard 1825 case size.