The capacitors are CAP CER 1PF 50V C0G/NP0 0505 with a capacitance value of 1 picofarad and an accuracy of ±0.05 pF. They have a voltage rating of 50 volts and come in the compact 0505 (1313 Metric) case size, specifically designed for the C0G or NP0 type ceramic capacitor.