The FPB SERIES is our Felsenthal Pointer Bar Series; this style knob has been utilized for many different applications its original design and manufacture was at the Felsenthal Company in Chicago. It is made to the original MS25165/25666 specifications, but has been updated to meet all the latest military and Avionic specifications. We have manufactured it with many different markings and colors. It is used in general for rotary switches where torque may require a better grip. This unit is also utilized for control of Potentiometers and other rotary devices. All of our backlighted knobs can be manufactured for night vision use. Our knobs meet NVIS Green A requirements.