The CAP CER 4PF 150V C0G/NP0 0505 is a ceramic capacitor with a capacitance of 4 picoFarads and a tolerance of ±0.05pF. It has a working voltage rating of 150 volts and is constructed using the C0G, or NP0, dielectric material. This capacitor comes in the metric case size 1313 equivalent to 0505 in imperial measurements, making it suitable for various electronic applications.