Yaesu YF-110CN  250hz CW filter (455Khz center), also known as the XF-F filter and XF-455K-251-01 , for Yaesu FT-1000, FT-1000D and also goes in FT-1000MP, FT-1000MP Mark V Field, FT-1000MP Mark V, FT-990, FRG-100, FRG-100B, and possibly others (please check your manual),  in Good shape and working as it should.  Also known as XF-110CN and marked that way per Yaesu, same filter, the XF-110CN is without the mounting board, simply unsolder from the board and solder in to your radio if that's what it calls for, depending on your radio (check your manual). Just plug it in or solder it in (depending on your radio) and it's ready to go. No adjusting (maybe a menu selection depending on your radio), makes a huge difference in your reception! A “must have” for the serious CW’er. Buyer pays shipping for a well packed and insured shipment. Buy from me with confidence as I have excellent feedback.