A CAP CER 9.1PF 250V C0G/NP0 0505 is a ceramic capacitor with the following specifications: capacitance of 9.1 picofarads, tolerance of ±0.5 pF, and a voltage rating of 250 volts. It has a metric case size of 1313, which corresponds to a diameter of approximately 5 millimeters and a height of approximately 2.45 millimeters (with the 0505 designation). The C0G/NP0 dielectric is known for its stability over temperature.