This is a 0603 (1608 metric) size ceramic capacitor with the designation of CAP CER 1PF 250V COG/NP0. It has a capacitance value of 1 pF and a tolerance of ±0.05 pF, with a voltage rating of 250V. The type is specified as C0G or NP0, which are both temperature-compensating types of ceramic capacitors.