The WLG4-10-50-50-500-100 from Wainwright Instruments is a Low Pass RF Filter with Frequency DC to 10 / 50 MHz, Stopband Frequency Chosen Fco x 2 to 500 MHz, 3 dB Cutoff Frequency Choice of 10 to 50 MHz, Insertion Loss 0.4 to 0.5 dB, Rejection 50 dB. Tags: Module with Connector, Lumped Component Filter, Chebyshev Filter. More details for WLG4-10-50-50-500-100 can be seen below.