The 56 Series from Passive Plus Inc is a RF Capacitor with Capacitance 1.5 to 40 pF, Frequency 840 MHz to 2.9 GHz, Q Factor 200 to 500, Dielectric Strength 250 kV, Voltage (WVDC) 125 V. Tags: Trimmer Capacitors. More details for 56 Series can be seen below.