This is a 0603 (1608 metric) size ceramic capacitor with a capacitance of 13 picoFarads (pF), rated at ±20% and a voltage rating of 100 Volts. It has the CER 13PF 100V C0G/NP0 designation, indicating it is a C0G or NP0 type capacitor, which are known for their stability over temperature.