The 6MB/C-500/U250-18 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 371 to 629 MHz, Bandwidth 258 MHz (1dB), Center Frequency 500 MHz, Insertion Loss 0.87 dB, Upper Rejection 40 dB. Tags: Lumped Component Filter. More details for 6MB/C-500/U250-18 can be seen below.