This is a 1206-sized ceramic capacitor with the designation CER 10PF 1KV C0G/NP0. It has a capacitance of 10 picofarads and a tolerance of ±5%. The voltage rating is 1000 volts, or 1 kilovolt. This component belongs to the C0G (NP0) class of ceramic capacitors, which are known for their stability and low loss over temperature.