From Vintage Organs Online

The KBF-1 is an exact reproduction of the B-3 type upstop felt. An essential part of
any Hammond console restoration or busbar lube job, it helps restore the new feel and
quiet operation to the keyboard. Supplied by Trek II. Easily installed on late A-100, B-3, C-3, and D-100 organs. Sold by the EACH - Order Two if you want to do both manuals!

Hammond® and Leslie® are both registered trademarks of Hammond Suzuki USA, Inc.
Trek II ® is a registered trademark of Trek II Products, Inc.