The part number is CAP CER 43PF 250V C0G/NP0 1206. This refers to a ceramic capacitor with a capacitance of 43 pF and voltage rating of 250V. It is a C0G or NP0 type, which means it has a very stable temperature coefficient. The component is packaged in the 1206 case size, which is equivalent to 3216 in metric measurements.