The CAP CER 39PF 1KV C0G/NP0 1812 is a specific type of ceramic capacitor. It has a capacitance value of 39 pF with a tolerance of ±10% and can withstand voltages up to 1000V (1kV). This capacitor falls under the C0G or NP0 classification, which indicates its temperature stability, and it measures 1812 in inches or 4532 metric. It is also known as 1B.