This is a high-value ceramic capacitor with specific properties: CAP CER 39PF 2KV C0G/NP0 1111 - a 39 pF capacitance value ±2% tolerance and a voltage rating of 2000V, or 2kV. It has the designation "C0G" or "NP0," which indicates it is made from ceramic materials and falls within the class of temperature-stable capacitors known as C0G/NP0, specifically type 1111 in metric size (2828).